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MTU to supply diesel powerpacks for Intercity Express Programme

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I think the most exciting snippet of information from this information can be found in the Internation Rail Journal:

The first train for Great Western will be completed in June 2014, and test operation on the British network is due to begin in May 2015. The trains will enter service on the Great Western Main Line from April 2017, and on the East Coast Main Line from June 2018.

Seems to me it is confirmed that we shall be seeing the SET in the UK way before the County Durham factory is up and running and well, i am rather excited for 2014!!

(The Journal also says that 4 x 5 Car Bi-Modes shall be built in Japan, before production is transfered to the UK)
 

WatcherZero

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That gives the three engined 5 car bi-mode 2800hp, only marginally less than the 3000hp four engined class 220's and with the weight reduction of the IEP's roughly the same power to weight ratio.
 

BestWestern

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I think the most exciting snippet of information from this information can be found in the Internation Rail Journal:



Seems to me it is confirmed that we shall be seeing the SET in the UK way before the County Durham factory is up and running and well, i am rather excited for 2014!!

(The Journal also says that 4 x 5 Car Bi-Modes shall be built in Japan, before production is transfered to the UK)

I'm sorry to say that I find nothing remotely exciting about IEP :| Voyager MKII, only this time with an even more fatal design flaw, that being a bloody great big MTU 'Power Pack' hanging needlessly beneath each carriage!
 

ainsworth74

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Seeing as none have been built yet and we don't even have a finalised interior spec I'm not sure how we can say that they're going to be Voyager Mk2? Personally, I'm going to withhold final judgement until the things are actually in service.
 

RichmondCommu

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I'm sorry to say that I find nothing remotely exciting about IEP :| Voyager MKII, only this time with an even more fatal design flaw, that being a bloody great big MTU 'Power Pack' hanging needlessly beneath each carriage!

I dare say that progress has been made in sound insulation since the Voyagers were built. Let’s wait and see shall we before making too many hasty judgments?
 

Peter Sarf

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Name me a diesel train that is not noisy in the coach - apart from the HST. My 20 year old car is quieter but I dont expect that much progress on a railway coach since the Voyagers. Get rid of the damn engines and electrify properly.

EDIT - I should say that my concern is that there seems to be something inherantly difficult about soundproofing the engine in a railway coach compared to a car. I can only imagine it is the size of the engine versus the stiifness of the coach. Maybe a railway coach acts more like a sound box than a car does. Maybe its that the engine is effectivly alongside the compartment rather than at one end.
 
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fgwrich

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There's an interesting discussion going on at the moment about this over on WNXX - One of the point's that's going to be interesting with this engine is that it will use ADBlue - a product which is also known to corrode steel tanks. Problem is, is that this will be kept in a steel tank with will need to take abuse from the usual underfloor debris including flying ballast, whilst trying not to leak any adblue onto any other parts of the metal, including steel wheels on steel rails.
 

Royston Vasey

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There's an interesting discussion going on at the moment about this over on WNXX - One of the point's that's going to be interesting with this engine is that it will use ADBlue - a product which is also known to corrode steel tanks. Problem is, is that this will be kept in a steel tank with will need to take abuse from the usual underfloor debris including flying ballast, whilst trying not to leak any adblue onto any other parts of the metal, including steel wheels on steel rails.

Adblue is a solution of urea which is used widely in commercial vehicles already for emission control. The fuel systems will be designed to contain it. Its more benign than a tank of diesel and even a catastrophic leak will be no threat to a solid steel rail or train superstructure. I don't know what is being speculated on WNXX but by the sound of it, its probably nonsense
 

sprinterguy

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I'm sorry to say that I find nothing remotely exciting about IEP :| Voyager MKII, only this time with an even more fatal design flaw, that being a bloody great big MTU 'Power Pack' hanging needlessly beneath each carriage!
As WatcherZero essentially says, the IEPs won't have an engine underneath each carriage. Both of the driving cars in the 5-car Bi-mode train will be unpowered, and on the nine carriage train there will be four unpowered carriages.
 

ryan125hst

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As WatcherZero essentially says, the IEPs won't have an engine underneath each carriage. Both of the driving cars in the 5-car Bi-mode train will be unpowered, and on the nine carriage train there will be four unpowered carriages.

I didn't even know that they were getting underfloor engines. Have they changed the design? All that I have seen is this document:
http://www.agilitytrains.com/assets/pdf/AT-090205-Key_Facts-Released-1_5.pdf
Which suggests that the diesel engines will be in the driving cars.

The only underfloor engines that it might have are the emergency engines on the electrics. That's what I thought anyway.
 

sprinterguy

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I didn't even know that they were getting underfloor engines. Have they changed the design? All that I have seen is this document:
http://www.agilitytrains.com/assets/pdf/AT-090205-Key_Facts-Released-1_5.pdf
Which suggests that the diesel engines will be in the driving cars.

The only underfloor engines that it might have are the emergency engines on the electrics. That's what I thought anyway.
That is a really old release. The IEP has been planned with underfloor engines since late 2010.
 

DarloRich

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i am rather excited for 2014QUOTE]

I am not - it will be then end of any enjoyment about travelling by train in this country.

It is a stupid design being promulgated by stupid people and being supported by stupid people.

Am I the only person who thinks that a carting about several tonnes of diesel "power pack" engines, fuel and fuel tanks on an electric train is a not a good idea?

I have a plan - build an electric locomotive, a fixed rake of coaches and a DVT THEN when the electric runs out, and here is the heretical part, remove the electric locomotive and replace it with a dual purpose diesel locomotive. I know we could call them Class 67's

The world is run by morons and people who should, frankly, be shot. This train will be an embarrassment to our country, disgusting to travel on and a colossal waste of money :roll:
 

corfield

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????

I like travelling on 16X and 22X series trains. The engines do not bother me at all, happy to sleep on these trains in fact. My partner (who has precisely zero interest in trains but who similarly commutes and travels around the UK), cannot tell me what is different about a Networker/Turbostar, Voyager, Desiro, Pendolino or HST, other than “they look different on the inside” and “they are different colored on the outside”, i.e. interior fit & livery. When I point out the presence of diesel engines she becomes aware of that particular noise source, but overall says it wouldn’t occur to her this was any different to one that didn’t have them, and when I point out we are on a train without them, is unable to identify the difference in ambient noise. I’d rate her as an intelligent passenger who is not unfussy (definitely not !), but to whom the passion of the poster above appears as the ravings of an obsessive lunatic.

IEP looks a great train to me, the bi-mode seems sensible given the patchy electrification at present, and by no means any certainty over future progress. Having self contained sets must be vastly cheaper in terms of manning and logistics, which from my experience of transport systems in other industries, is always the driver of total system cost. It also seems much more efficient use of resources and time (another driver of cost), than having various fleets of locos, coaches and all trying to carry out loco changes all over the place, which we see on the Caly Sleeper and seems daft.

I think some people need to get out more, or even better, try viewing the world from the perspective of normal people.
 

sprinterguy

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That's a shame as they will probably end up being louder than the HST's they are replacing! What made them change their mind?
To quote what was announced at the time that the underfloor engine arrangement was unveiled:

Agility admit they got the initial design wrong saying they were stuck in the HST mentality designing a like for like replacement rather than improving the formation. The bi-mode power will be a 670-940hp (500-700kw) power unit (Referred to as an AGU) under three coaches. Each AGU weighs 16t and one would have been carried by the EMU version to allow a 40mph limp home anyway, so they decided to use the AGU as primary power and so it saves weight on a single power car which would have weighed 60t.

It is apparent therefore that Agility Trains have selected a power unit at the top end of the range that they identified, rated at 940hp. As happy as I am to point out that about 40% of the carriages in either the 5-car or 9-car Bi-mode trains will be unpowered, it does astound me that they are intending to fit a power unit developing virtually the same power output as a class 20 or a Blue Pullman unit under the floor. :shock: I really do hope that I am correct in saying that soundproofing and engine silencing has come an awfully long way since the fifties and sixties, and I hope that it has advanced from the Voyager design!
--- old post above --- --- new post below ---
IEP looks a great train to me, the bi-mode seems sensible given the patchy electrification at present, and by no means any certainty over future progress. Having self contained sets must be vastly cheaper in terms of manning and logistics, which from my experience of transport systems in other industries, is always the driver of total system cost. It also seems much more efficient use of resources and time (another driver of cost), than having various fleets of locos, coaches and all trying to carry out loco changes all over the place, which we see on the Caly Sleeper and seems daft.
Electrification should not be patchy when it is a new project like the GWML. The wires should extend to Cheltenham and beyond Cardiff to Swansea (Which I believe is now confirmed). I can however understand the benefit that Bi-mode has on incremental services on both the GWML and ECML, with only a handful of trains each day, such as out beyond Swansea to South Wales, to Weston-super-Mare, and to Lincoln, Harrogate, Inverness and Aberdeen (It is a shame that we are not going to see electrification to Aberdeen this decade).

The alternative on the ECML however was mooted by Chris Garnett and GNER in around 2000 and involved purchasing a new fleet of electric trains (Intended to be Pendolinos), which would have allowed the 225s to be cascaded to replace HSTs by being loco hauled off the wires. It would even be possible to fit a diesel power car in the place of the DVT to maintain the fixed formation operation of the trains.
 

DarloRich

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????

I like travelling on 16X and 22X series trains. The engines do not bother me at all, happy to sleep on these trains in fact. My partner (who has precisely zero interest in trains but who similarly commutes and travels around the UK), cannot tell me what is different about a Networker/Turbostar, Voyager, Desiro, Pendolino or HST, other than “they look different on the inside” and “they are different colored on the outside”, i.e. interior fit & livery. When I point out the presence of diesel engines she becomes aware of that particular noise source, but overall says it wouldn’t occur to her this was any different to one that didn’t have them, and when I point out we are on a train without them, is unable to identify the difference in ambient noise. I’d rate her as an intelligent passenger who is not unfussy (definitely not !), but to whom the passion of the poster above appears as the ravings of an obsessive lunatic.

IEP looks a great train to me, the bi-mode seems sensible given the patchy electrification at present, and by no means any certainty over future progress. Having self contained sets must be vastly cheaper in terms of manning and logistics, which from my experience of transport systems in other industries, is always the driver of total system cost. It also seems much more efficient use of resources and time (another driver of cost), than having various fleets of locos, coaches and all trying to carry out loco changes all over the place, which we see on the Caly Sleeper and seems daft.

I think some people need to get out more, or even better, try viewing the world from the perspective of normal people.

So I am not a normal person and am an obsessive lunatic? Thanks for that.
Sorry that I don’t think that everything modern, new and shiny is inherently better than anything that has gone before. Forgive me for daring to have an opinion.

I will assume that you travel short distances, on a less than regular basis, on 220 & 221 trains (the 222 don’t not have quite the same problems). I don’t. I have to suffer these things all the time. I travel up and down the country several times per week for work. I would suggest trying Edinburgh to Exeter on one of your beloved Voyagers and then say you don’t notice the noise, the rattle, the lack of proper catering, the less than comfortable of the seat, the fact that people are crammed in like sardines and the fact that you can never get a mobile signal . It isn’t pleasant. It is almost impossible to work on these trains which is a serious problem for me. I have been on ones where the vibration is so bad you cant even read the screen of your lap top!

My suggestion was to run the trains in fixed formation with only the locomotive changing en route. Which is more comfortable? You would have one locomotive change at one location. This could occur in a few minutes and certainly much quicker than the DFT have suggested. One of my former colleagues started out as a shunter. He said that if it had taken him the length of time suggested by DFT to uncouple and couple locomotives after a change from electric to diesel he would have been sacked! You could even use existing locomotives to keep the costs down. The fleet of class 67 locomotives would be ideal for this work.

It also seems stupid to claim environmental bonuses from this train when you are increasing the weight of the unit massively with engines fuel etc which means you need to burn up more carbon to create more electricity to power the train! How and when do you start the engines? Do you start them up in motion before the traction changeover point or do you do it whilst at the station change over point? I hope the plan isnt to run them for the whole journey!

I have no problem with units generally. They are essential for local, short or inter regional services. My view is that they are not suitable for long distance intercity services. It is my view that they do not offer a suitable level of passenger comfort, journey experience or facilities for a long distance journey.

However all that said the most important thing to me is the comfort to the passenger on a long distance journey ( and no matter what people say) these trains are aimed at long distance inter city travellers. I expect the interior of the train to be very similar to a Pendolino or a Voyager rather than a MKII or a MKIV. Compare a MKIV set with a Voyager. Which is the better train to travel on for a long distance?
 
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Yew

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I am not - it will be then end of any enjoyment about travelling by train in this country.

It is a stupid design being promulgated by stupid people and being supported by stupid people.

Am I the only person who thinks that a carting about several tonnes of diesel "power pack" engines, fuel and fuel tanks on an electric train is a not a good idea?

I have a plan - build an electric locomotive, a fixed rake of coaches and a DVT THEN when the electric runs out, and here is the heretical part, remove the electric locomotive and replace it with a dual purpose diesel locomotive. I know we could call them Class 67's


The world is run by morons and people who should, frankly, be shot. This train will be an embarrassment to our country, disgusting to travel on and a colossal waste of money :roll:

Sounds alright to me, :)

I'm kind of hoping that When the IEP comes along it will somehow be astoundingly smooth, quiet and comfortable, with good visibility out the windows and down the coach, but yet providing enough priviacy. Unfortuantely I think I will be let down by a Diesel 395.
 

WatcherZero

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That's a shame as they will probably end up being louder than the HST's they are replacing! What made them change their mind?

Main thing is its easier to make several smaller low emmission clean engines than a single large one, though there are other advantages to distribution wuch as lower axle weight, more saloon space space, etc...
 

Peter Sarf

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????I think some people need to get out more, or even better, try viewing the world from the perspective of normal people.

If the IEP turns out the way most of us expect then I will not be getting out much except by car.

The indications are that IEP will be awful. The railways have failed so far to address the vibration and noise that is particularly noticeable in coaches with an underfloor engine. Why is my 20 year old car quieter ?. I look forward to being wrong about the noise but I am being realistic.

Trains seem to be heading towards the ambience of a jet plane. I dont mind jet planes as, in most cases, there is no alternative and I accept that the engines are noisy. But on an intercity train the engines dont have to be strapped to passenger coaches do they.
 

starrymarkb

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How long would the diesel generators be running for? Ideally they'd be started approaching the changeover point (ie on a Weston run start the engines at Bristol or an Aberdeen run start them at Edinburgh), most of the run would then have a quiet EMU ambiance with engine noise for the last hour or so (OK Inverness would be a while though but hopefully the wires will extend north during the lifetime of the trains)

It would be rather idiotic for the engines to be run constantly even when on AC power
--- old post above --- --- new post below ---
I think some people need to get out more, or even better, try viewing the world from the perspective of normal people.

I have to agree, most passengers don't notice the engine noise. I remember my Mum taking a Voyager trip and commenting on how smooth it was ("riding on air" were her words)
 

WatcherZero

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I only notice engine noise when on a Pacer or Sprinter and their revving up to pull away from the platform. Im far more bothered by noisy air conditioning.
 

Chris125

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It doesnt matter how good the soundproofing is, or whether ordinary passengers care about the travelling experience - the fundamental problems with IEP are the way its financed with a hugely complex PFI, loading extra costs onto an industry being forced to find huge efficiencies, and the way the DfT led its design rather than the rail industry who'd actually use it.

Chris
 

ryan125hst

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I am not - it will be then end of any enjoyment about travelling by train in this country.

It is a stupid design being promulgated by stupid people and being supported by stupid people.

Am I the only person who thinks that a carting about several tonnes of diesel "power pack" engines, fuel and fuel tanks on an electric train is a not a good idea?

I have a plan - build an electric locomotive, a fixed rake of coaches and a DVT THEN when the electric runs out, and here is the heretical part, remove the electric locomotive and replace it with a dual purpose diesel locomotive. I know we could call them Class 67's

The world is run by morons and people who should, frankly, be shot. This train will be an embarrassment to our country, disgusting to travel on and a colossal waste of money :roll:

I see what you mean about the diesel engine and fuel tanks on electric trains- Carting around a dead weight for most of the time will surely increase the acceleration rate slightly and increase costs due to increased electrical usage.

However, from what I have seen: On electric only trains, they are an emergency power source which is a good idea in my option. It will enable, firstly, the lighting and air conditioning to be powered if the OLE is off for whatever reason. Did you hear about the time passengers in a 225 were stranded in the London area (can't remember the exact location) due to the wires failing? The temperature in the coaches became ridiculously high, passengers were smashing windows for air ect.

Secondly, it enables shunting around the depot and will probable enable the train to limp to the nearest station as well. I don't know how fast it will be able to run on the engine, but if it is powerful enough, it might be useful for diversions (I doubt this though).

I certainly agree using loco hauled coaches and a DVT- it would be a much quieter ride for a start. However, instead of having to change loco's, how about building a combined diesel and electric locomotive? Just think if you had, for example, a class 67 combined with a class 91. That would be a perfect combination (obviously, it would need to be designed from scratch though!) The question is, would there be enough room for all the equipment in one loco, and what would the RA be like?

You would still be carrying a diesel engine and fuel under the wires, but it would be useful for diversions. A ETS generator could be fitted to the DVT (like Chiltern's DVT's) for emergencies as well. Maybe the DVT could also be fitted with motors to enable the DVT to clear the line and the passengers to get off if it was to fail.
 

D365

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How long would the diesel generators be running for? Ideally they'd be started approaching the changeover point (ie on a Weston run start the engines at Bristol or an Aberdeen run start them at Edinburgh), most of the run would then have a quiet EMU ambiance with engine noise for the last hour or so (OK Inverness would be a while though but hopefully the wires will extend north during the lifetime of the trains)

It would be rather idiotic for the engines to be run constantly even when on AC power.

I doubt that the engines would have to run constantly, considering how other countries have bi-mode trains. It would negate the benefits of electrification.

When the 8 IC125s were modified for running with a 91 loco [while the Mk4 stock was being built] replacing one 43, the other had to be kept running in order to power the Mk3 stock. Keeping the engines at low revs wasn't good for them, so the power was turned up and we got a IC125*225! Not an efficient method, but I would have loved to see a set in action; idea for a preservation group?


I see what you mean about the diesel engine and fuel tanks on electric trains- Carting around a dead weight for most of the time will surely increase the acceleration rate slightly and increase costs due to increased electrical usage.

However, from what I have seen: On electric only trains, they are an emergency power source which is a good idea in my option. It will enable, firstly, the lighting and air conditioning to be powered if the OLE is off for whatever reason. Did you hear about the time passengers in a 225 were stranded in the London area (can't remember the exact location) due to the wires failing? The temperature in the coaches became ridiculously high, passengers were smashing windows for air ect.

Secondly, it enables shunting around the depot and will probable enable the train to limp to the nearest station as well. I don't know how fast it will be able to run on the engine, but if it is powerful enough, it might be useful for diversions (I doubt this though).

I certainly agree using loco hauled coaches and a DVT- it would be a much quieter ride for a start. However, instead of having to change loco's, how about building a combined diesel and electric locomotive? Just think if you had, for example, a class 67 combined with a class 91. That would be a perfect combination (obviously, it would need to be designed from scratch though!) The question is, would there be enough room for all the equipment in one loco, and what would the RA be like?

You would still be carrying a diesel engine and fuel under the wires, but it would be useful for diversions. A ETS generator could be fitted to the DVT (like Chiltern's DVT's) for emergencies as well. Maybe the DVT could also be fitted with motors to enable the DVT to clear the line and the passengers to get off if it was to fail.

An interesting idea. For any pure electric sets, perhaps just the smaller generator/engine could be used in case of electric failure, like you've suggested in the last paragraph.
 

junglejames

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????

I like travelling on 16X and 22X series trains. The engines do not bother me at all, happy to sleep on these trains in fact. My partner (who has precisely zero interest in trains but who similarly commutes and travels around the UK), cannot tell me what is different about a Networker/Turbostar, Voyager, Desiro, Pendolino or HST, other than “they look different on the inside” and “they are different colored on the outside”, i.e. interior fit & livery. When I point out the presence of diesel engines she becomes aware of that particular noise source, but overall says it wouldn’t occur to her this was any different to one that didn’t have them, and when I point out we are on a train without them, is unable to identify the difference in ambient noise. I’d rate her as an intelligent passenger who is not unfussy (definitely not !), but to whom the passion of the poster above appears as the ravings of an obsessive lunatic.

IEP looks a great train to me, the bi-mode seems sensible given the patchy electrification at present, and by no means any certainty over future progress. Having self contained sets must be vastly cheaper in terms of manning and logistics, which from my experience of transport systems in other industries, is always the driver of total system cost. It also seems much more efficient use of resources and time (another driver of cost), than having various fleets of locos, coaches and all trying to carry out loco changes all over the place, which we see on the Caly Sleeper and seems daft.

I think some people need to get out more, or even better, try viewing the world from the perspective of normal people.

Im sorry, but any normal person can tell the difference between engine noise and no engine noise. You cant say someone isnt normal because they can hear an engine underneath them. There are reasons people dont like underfloor engines, and you dont have to be abnormal to not like them.
All this talk of enthusiasts not being normal strikes me as idiocy.
Its like me turning round to someone who doesnt like Pacers, and saying they obviously arent normal if they dont like them. It just doesnt make sense.

Anyway, onto some very normal talk. Various fleets of locos and coaches? Nope. Only 1 type of coach, instead of the 3 types of coaches with IEP (EMU coach, bi mode coach with no diesel engine, and bi mode coach with diesel engine).
Daft loco changes with extra drivers? Now where will the majority of loco changes be taking place? Thats right, Edinburgh. Now in which station do all these affected trains change drivers at anyway? Thats right, Edinburgh. Now, thirdly, for 100 points. In which station do these effected trains sit in for nearly 10mins as it is anyway? Yep, you got it. Its Edinburgh again.

Now a few more questions for you. What is more efficient? A load of small engines, or 1 big engine? Yep, you are getting clever. Its 1 big engine, ie a loco.
What is it that the effected railway managers do not want? Yep, you really are spot on today, its the IEP.
Finally, what has been worked out to be one massive waste of money? Yep, IEP in its current form.

Anyway, as i am obviously abnormal because i can hear diesel engines, I will leave it to the people who know what they are talking about. The managers and engineers who have to deal with IEP. Oh look, they agree with me. IEP is DaFT.
--- old post above --- --- new post below ---
Main thing is its easier to make several smaller low emmission clean engines than a single large one, though there are other advantages to distribution wuch as lower axle weight, more saloon space space, etc...

So im assuming the 68s wont comply with current regs? Youd better tell that to Mr DRS, as i have a feeling he is expecting these things to arrive.
Lower axle weight? Over the length of the train there is little difference.
More saloon space? Im lost. All these gubbins they have taken out of the loco, havent they gone and squeezed it around the passenger on the passenger coach? I thought they had. MUs have LESS saloon space. They even have to start adding extra little cubby holes to fit things in. these cubby holes being above the floor in areas that should be given over to passengers. Most panto coaches usually have lower roof lines as well. Less saloon space.
As for all this talk of locos and DVTs taking up space. Its not quite as clear cut. A third of two 23m coaches are given over to crumple zones. I make that around 15/16m. Only about 3 or 4 m less than the length of a loco.
The DVT also allows the guard to have a decent office. One which doesnt need to take up passenger space as in the pendys.
So in reality, the only extra length is the DVT. This provides fantastic luggage space, which on some trains really is needed, and also allows you to add a nice little gennie, just like Chiltern have shown. Combine this with the increased saloon space on the LHCS, and the fact engineers prefer a nice single large engine, and the fact the nice single large engine is more efficient. Id say all those benefits easily outweigh a single DVT.
--- old post above --- --- new post below ---
I certainly agree using loco hauled coaches and a DVT- it would be a much quieter ride for a start. However, instead of having to change loco's, how about building a combined diesel and electric locomotive? Just think if you had, for example, a class 67 combined with a class 91. That would be a perfect combination (obviously, it would need to be designed from scratch though!) The question is, would there be enough room for all the equipment in one loco, and what would the RA be like?

You would still be carrying a diesel engine and fuel under the wires, but it would be useful for diversions. A ETS generator could be fitted to the DVT (like Chiltern's DVT's) for emergencies as well. Maybe the DVT could also be fitted with motors to enable the DVT to clear the line and the passengers to get off if it was to fail.

This bimode loco is just making life complicated. Have an electric loco, and a seperate diesel loco. A bimode loco would just mean you have to compromise somewhere. Also, with DRS ordering 68s, and Chiltern looking beyond 67s, surely a larger order for 68s is a wise idea, and should save a little bit of money.
The gennie in the DVT also covers the emergency engine included in the electric IEPs. The LHCS option with loco changes and DVT has everything the IEP has, and more, and doesnt have any of the drawbacks.
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I certainly agree using loco hauled coaches and a DVT- it would be a much quieter ride for a start. However, instead of having to change loco's, how about building a combined diesel and electric locomotive? Just think if you had, for example, a class 67 combined with a class 91. That would be a perfect combination (obviously, it would need to be designed from scratch though!) The question is, would there be enough room for all the equipment in one loco, and what would the RA be like?

You would still be carrying a diesel engine and fuel under the wires, but it would be useful for diversions. A ETS generator could be fitted to the DVT (like Chiltern's DVT's) for emergencies as well. Maybe the DVT could also be fitted with motors to enable the DVT to clear the line and the passengers to get off if it was to fail.

This bimode loco is just making life complicated. Have an electric loco, and a seperate diesel loco. A bimode loco would just mean you have to compromise somewhere. Also, with DRS ordering 68s, and Chiltern looking beyond 67s, surely a larger order for 68s is a wise idea, and should save a little bit of money.
The gennie in the DVT also covers the emergency engine included in the electric IEPs. The LHCS option with loco changes and DVT has everything the IEP has, and more, and doesnt have any of the drawbacks.
 

nick.c

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Joined
12 Mar 2012
Messages
64
I travel on a Voyager to get to work. Quite like them actually - for a 40 minute stint. Also vastly better than the FGW Class 150 alternative. Having said that I do prefer travelling in a refurbished HST as the end of a long day. Therefore I'm not sure about the underfloor engines planned for IEP.
 

tbtc

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Reston City Centre
Gosh - who'd have thought that a thread specifically about the power packs would turn into another tedious set of arguments about why people hate IEP!

We've been over this enough times, but for the sake of defending these trains (which nobody has been on yet, but so many "experts" seem to know the noise levels on board!)...

  • The diesel noises will presumably only be an issue in certain coaches when running away from the wires (like Swindon to Cheltenham or Bristol to Cheltenham or Swansea to Carmarthen) - not all the way to London
  • Plenty of lines are being electrified - saying "why don't we have a proper electrification" seems odd when you consider the hundreds of miles being done in CP5 - how much more do you think they can realistically wire up in five years?
  • Other than acceleration when leaving a station, I barely notice engine noise on most DMUs - honestly.
  • I love those enthusiasts who insist on sitting in the front coach of a loco hauled train (or HST) yet get sniffy about the noise of a DMU :lol:
 

HSTEd

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Joined
14 Jul 2011
Messages
20,355
Loco hauled services with loco changes are just too complicated to operate reliably these days, especially once you take account of all the acceleration and energy efficiency disadvantages to conventional loco hauled operations compared to multiple unit ones.

And before anyone suggests EMU drags, those are less energy efficient overall than simply using bi mode units since you have to run a locomotive around weighin 80t for a significant portion of the route rather than ~12-20t of diesel engines/fuel for the entire route, most of which is under electric traction with its reduced energy use.
 

Yew

Established Member
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12 Mar 2011
Messages
7,244
Location
UK
Loco hauled services with loco changes are just too complicated to operate reliably these days, especially once you take account of all the acceleration and energy efficiency disadvantages to conventional loco hauled operations compared to multiple unit ones.

We have stated that single engines are more energy efficient than smaller ones, and although in some cases MU's have greater acceleration, its not that important on IC routes, and is uaually down to the MU's being overpowered and thirsty. More thrifthy DMU's sunce as 168's have lower eacceleration than a 67 and 6 coaches on IC routes.
 
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