• Our new ticketing site is now live! Using either this or the original site (both powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!

GWR IETs and GWML Ride Quality

Status
Not open for further replies.

EIKN

Member
Joined
19 Sep 2017
Messages
113
Most of Hitachi's stuff outside the UK is decent tho especially ride quality like the JR700 and my Personal fav the JR500. The 395s are also very well built and ride well outside of HS1 specifically. Just shows pay the proper amount of money and things usually are built well(DFT!!). That aside the GWML has been and till works properly done will be lively ride wise on the IETs and thats only slightly worse than the HSTs because of the lighter bodies as a whole plus the seating package the DFT selected.
Thank you for the photo of the Japanese AT300.
Just slightly off topic , is the class 395 an AT300? - commuter version ( doors not at the coach ends ) could the 395, run on say the Wcml and Ecml or even. between Edinburgh and Glasgow, I only ask as Scotrail and Southern are looking for trial fleet renewals .
I'd have thought the 395 would perfect for the rebuilt Airdrie Bathgate line .between Edinburgh and Glasgow, or to Stirling and alloa , or Is it Dunbar or drem where their electric routes finish ?.
They would be great to add to the Scotrail Intercity fleet, only thing is the third rail.gear, would need to be swapped for battery or diesel .- only mention this as I said due to Southesst, looking to a total fleet renewal, I guess that includes the 395.
I'm not sure if it's an AT300 or 100, I think the Scotrail AT200 is the class 385.

Also the EMR810's are shorter like a 395 , if only by 2m , and have a different nose ( not yet seen with the nose cone attached ), but I thought it part resembled the 395 at the front .
Interestingly as well LNER , must have an issue with their IET , because they are not looking to Hitachi , to replace the 91's, hence thyeve spent money , on the new look and done some refurbishment, ( according to one of the rail magazines).
It was by all accounts based on passenger feedback and other issues .
( maybe they can just take the Transpennine sets and order more mark5's from CAF and , class 93's from stadler ).
Anyway the government dropped the ball on the HST replacement project , I have the book called ' beyond the HST ', some diagrams of trains are regional type and resembled the GA Flirts .

I've also read that during the consultation between government, public and train companies, both the public and train companies, had set a preference for what I think was UK based Alstom ( the company and site where the HST's where built , and others recently, please excuse my bad memory I have a chronic condition that causes brain fog ) so I cannot name the company or group , UK based that had I think a loco hauled , evolution of the HST sets .
It had better seating by a long way , and train operators preferred it too, citing softer due for consumers , less track wear etc.
But Hitachi undercut the price and the rest is history .
Given the IET's are now about 5-6 years old, and need to all be brought in one at a time to sort the cracks and other issues , it wound be an ideal time to change the seats .
Based on the ones chosen perhaps by EmR which customer focus groups had given good reviews when they sought public opinion.
They need to reduce the brightness of the lighting , it's headache inducing , having seen ' trip report videos ' .
Perhaps the best interior are the Scotrail first class mark3 coaches , and Chiltern ones , and the Pendilino sets both refurbed and prerefurbed .
Also they need to put a buffet car area on the GWR sets, as a 5 hour+ journey without one , is ludicrous.
And while they sort the cracks in the bogies , perhaps they can alter the suspension system to cushion the ride more.
An expensive job , but given these trains are hopes to last at least as long as a 91, it should be a no brainer .
And would arguably, attract more folk from their cars .
 
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

NSEWonderer

Established Member
Joined
5 Dec 2020
Messages
2,904
Location
London
Thank you for the photo of the Japanese AT300.
Just slightly off topic , is the class 395 an AT300? - commuter version ( doors not at the coach ends ) could the 395, run on say the Wcml and Ecml or even. between Edinburgh and Glasgow, I only ask as Scotrail and Southern are looking for trial fleet renewals .
I'd have thought the 395 would perfect for the rebuilt Airdrie Bathgate line .between Edinburgh and Glasgow, or to Stirling and alloa , or Is it Dunbar or drem where their electric routes finish ?.
They would be great to add to the Scotrail Intercity fleet, only thing is the third rail.gear, would need to be swapped for battery or diesel .- only mention this as I said due to Southesst, looking to a total fleet renewal, I guess that includes the 395.
I'm not sure if it's an AT300 or 100, I think the Scotrail AT200 is the class 385.

Also the EMR810's are shorter like a 395 , if only by 2m , and have a different nose ( not yet seen with the nose cone attached ), but I thought it part resembled the 395 at the front .
Interestingly as well LNER , must have an issue with their IET , because they are not looking to Hitachi , to replace the 91's, hence thyeve spent money , on the new look and done some refurbishment, ( according to one of the rail magazines).
It was by all accounts based on passenger feedback and other issues .
( maybe they can just take the Transpennine sets and order more mark5's from CAF and , class 93's from stadler ).
Anyway the government dropped the ball on the HST replacement project , I have the book called ' beyond the HST ', some diagrams of trains are regional type and resembled the GA Flirts .

I've also read that during the consultation between government, public and train companies, both the public and train companies, had set a preference for what I think was UK based Alstom ( the company and site where the HST's where built , and others recently, please excuse my bad memory I have a chronic condition that causes brain fog ) so I cannot name the company or group , UK based that had I think a loco hauled , evolution of the HST sets .
It had better seating by a long way , and train operators preferred it too, citing softer due for consumers , less track wear etc.
But Hitachi undercut the price and the rest is history .
Given the IET's are now about 5-6 years old, and need to all be brought in one at a time to sort the cracks and other issues , it wound be an ideal time to change the seats .
Based on the ones chosen perhaps by EmR which customer focus groups had given good reviews when they sought public opinion.
They need to reduce the brightness of the lighting , it's headache inducing , having seen ' trip report videos ' .
Perhaps the best interior are the Scotrail first class mark3 coaches , and Chiltern ones , and the Pendilino sets both refurbed and prerefurbed .
Also they need to put a buffet car area on the GWR sets, as a 5 hour+ journey without one , is ludicrous.
And while they sort the cracks in the bogies , perhaps they can alter the suspension system to cushion the ride more.
An expensive job , but given these trains are hopes to last at least as long as a 91, it should be a no brainer .
And would arguably, attract more folk from their cars .
It is part of the AT300 family yes like the IETs are. 385s are AT200 without digressing much. As for it running outside hs1 and Kent line I assume its possible but as a last remember (this discussion somewhere on the fourm) it would require a few safety system additions and tweaks ontop of the usual work for introducing rolling stock on a route.
 

EIKN

Member
Joined
19 Sep 2017
Messages
113
It is part of the AT300 family yes like the IETs are. 385s are AT200 without digressing much. As for it running outside hs1 and Kent line I assume its possible but as a last remember (this discussion somewhere on the fourm) it would require a few safety system additions and tweaks ontop of the usual work for introducing rolling stock on a route.
Hi , thank you for the reply , that clears up a long standing question I had, on my model rail layout , I have a station with two through lines on one side ( my layout is split so inahve two totally independent, DC lines , for stuff that won't take a chip as I'm not abkee to solder ), and the station has a bay platform , and an additional ' express ' platform , anyway point is , I have the Hornby 395 and 800's I noticed a few days ago , which got me wondering about the AT300 thing, when my 395 was level to the class 800 I'd stopped at the station , there is of course a little difference , if anything the 395, looks more like the Japanese one shown above .
I did think the 395 would probably need the third rail equipment taken off ( o. A side note, Ive never read of folk complaining about the class 395 seats , especially as they have no first class, however photos in the rail.magazine of the newly refurbished class 395's , show much smarter interiors , and the seats look fine , definitely less dull than the original interior .
However neither had the very bright lighting or at least it appeared in the magazine to be not as bright as that most complained about on the 800's .
But you can see the interiors bar the door placements, are pretty much the same , hence I wondered just how close to an 800 they are .
I'm surprised they didn't build more with diesel power for lines elsewhere.
And given the changes to the ECML to allow 140mph running , which I think but can't be sure is something to do with signals in a train cab?, my apologies if that seems a silly question, but I'm limited in my rail knowledge, both real and modeling .
But how that would work I don't know .
But the 395's look ideal for improving, higher speed commuter trains , in.the current crop of magazines each has a story on how many train operators are looking for totally new fleet's . It seems that the 395 and 800's are ideal , but as long as they can sort the terrible seats and ambience of the interior on the 800's.
That said EMT ( east Midlands) Thier 810's the seats resemble the ones used in the HST's when new , by all accounts, a lot of extra work has gone Into addressing , the seats and interior , of their 810's , with the hope people will approve.
The only thing I don't understand is why they are not building 7bcar sets like Avanti , because, their 222's are 7 cars ( or some are ), and with shorter vehicles then the rest of the 80X fleet's , is this going to be a repeat of the fiasco , when the voyagers, appeared , which had gone from fairly fast loco hauled Mark2E/F Aircon sets with pretty good Interiors and Mark3's all where often over 8 cars in length . Then they introduced the voyagers , they were no longer than a Mark2 or 3 , and we're only 4-5 cars . As far as I e read East Midlands has gone for shorter 5 car sets . I wonder how this will affect overcrowding.
And also to get back on topic. Of while they fixed the hated interior , which does look on the photo montages as very impressive, but have they fixed the ride quality as described, by you guys using GWR class 800 series trains .
Out of interest, is it right that , when they brought on the castle class sets , that they changed the more comfortable seats , for something more like the hated ones in the 800?.
I gather that the castles are to remain , but not as many .
Perhaps depending on the required numbers , GWR might take on the 68/Mark5 sets from TPE to replace the castles .
It is part of the AT300 family yes like the IETs are. 385s are AT200 without digressing much. As for it running outside hs1 and Kent line I assume its possible but as a last remember (this discussion somewhere on the fourm) it would require a few safety system additions and tweaks ontop of the usual work for introducing rolling stock on a

It is part of the AT300 family yes like the IETs are. 385s are AT200 without digressing much. As for it running outside hs1 and Kent line I assume its possible but as a last remember (this discussion somewhere on the fourm) it would require a few safety system additions and tweaks ontop of the usual work for introducing rolling stock on a route.
Thank you for reply and clarifying the version of the 385's , In one rail magazine recently, which was discussing, Scotrail's plans to do a huge fleet replacement ( getting rid of the awful 156's and the terrible units used on the Airdrie bathgate line would be much better) , however, I'd not be in a hurry to loose the smooth running and comfy class 158's that are described, in a book I have that covers every train type on UK and Irish railways , it's out yearly , but that tells how southwest trains regard their 158/159's as the rolls Royce of DMU's and I found them to be as smooth as a mark 3.
Anyway I digress , but mentioned them as there are going to be plenty for cascade ( hopefully to northern and Scotrail ).
But back to the A trains .
The 395, although it would need modifying , perhaps diesel motors instead of third rail , or an additional battery pack, that could be charged while the train is in motion.
It's clear from what I've read that southeastern, among others , will be replacing these , even though they are relatively young .
They'd be a great fit as bi modes , in Scotland and The Northern rail network or Transpennine.
And the sister trains the 800's as the last post said , can surely be fixed to passenger satisfaction, easily , with a change of seats to the ones planned for the 810's, which as I said , had been shown to the public , and under that consultation , concluded , that they would elimanate , the complaints, about uncomfortable seats.
They resemble the style or design seen in mark3 coaches back in the 80's , I gather that design was studied and used as a starting point , it was a very interesting article , it was all about the new trains due to come into service, and this was about the changes to the 810's over the other versions of the 800's of each operator .
I do think the Transpennine 800's look very smart , but haven't heard of any issues with seats or jittery rides on those.
And not much is said about the seperate fleet the 397.
It did seem odd that TPE didn't simply do as Avanti have and specify 7 and 5 car units when buying the 800's, or if they'd had 9 car sets for the Scottish services . I suspect had they done so , they could have avoided a lot of problems and provided more routes . Including Blackpool , I'm not aware if TPE even serve that station.

But regards GWR there is a fantastic opportunity here while fixing the cracks , to follow EMT's 810's and update the interiors , now 5-6 years old and replace with the seats used or to be used on the 810's.
They need more padding.
And why not use the same type of seats so popular from the old mark3 first class , which are now revered for comfort on Scotrail's HST's, those large leather seats , with softer lighting would be a great boost to the first class, and could even attract more use , and even demand for extra first class space , remember a HST used to run at least two First class coaches and the Buffer car, I believe at least on east coast sets was first clas seating , also they must add a buffet car or buffet area , ideally where LNER have theirs , the windows are already covered where LNER have theirs so it ought to be a lowish cost but much needed improvement. Especially given the length of the trips , basically, it shouldn't take much to dim the over bright lighting , and increase comfort , and perhaps add an additional trailer to a nine car or 5 car set , I'm sure Hitachi would welcome the work , the magazine stated , and this included GWR that , 2660 new trains or units are needed UK wide to replace worn out trains, or provide enough capacity that standing is no longer an issue and to make rail travel more attractive than driving .GWR could do so much better .

One thing I don't understand about how this works but given how cross country is about to make a huge mistake, by replacing much longer and well loved HST's with voyagers .
Would it not be possible for GWR, to apply to run Cross country services, to all points north ? Or when east west rail is finished , even run , Penzance to Yarmouth via Norwich .
Or Edinburgh, Glasgow , Stirling , Leeds, York , Newcastle, Manchester etc etc .
I thought that back in steam days before British rail , all the big train companies, ran in competition, on the same or parallel routes.
So could GWR do that today?.

My apologies for all these questions, but as I say I'm very interested in the subject but have little knowledge, beyond what I read or learn by talking to people like yourselves who know all about these things .
 

SolomonSouth

Member
Joined
25 Feb 2021
Messages
398
Location
Gravesend
In my experience IETs ride decently. 345s are a bit worse. 387s though are pretty shocking at speed, and even worse when coming into Paddington...
 

EIKN

Member
Joined
19 Sep 2017
Messages
113
The following is taken from wiki , regarding the improved seating and facilities on the new EMT trains class 810 ' aurora's .
"In response to customer feedback regarding seating comfort on earlier Class 80x units, both first- and standard-class seats on the Class 810 will be of a unique design that is intended to offer enhanced comfort. They will be based on the existing FISA Lean design, but of an altered appearance. EMR were working closely with Derby-based design company DGDESIGN on the design of the new interiors.[21] It is claimed that the seats will have wider cushions, more-sculpted headrests, softer and deeper armrests, additional privacy screening, and be upholstered in a wool-rich moquette that is intended to be easier to keep clean. Every passenger will have access to power sockets and USB charging points, at-seat coat hooks, and storage space under each seat. EMR intend the seats to be the most comfortable on the network when they are introduced."
The seats resemble as I mentioned the old IC7 seats of the earlier mark 3 coach seating and I think we're used on the Mark2F's which were I gather , using many features that would follow on the then upcoming mark3's .
So if EMT can do this , surely GWR and the rest ,LNER , Hull trains, TPE and Lumo ( not sure what Avanti have chosen ).
But here's hoping they followed EMT .
https://en.m.wikipedia.org/wiki/Wikipedia:Verifiability

== Doublepost prevention - post automatically merged: ==

In my experience IETs ride decently. 345s are a bit worse. 387s though are pretty shocking at speed, and even worse when coming into Paddington...
It seems to be that like Kings cross eventually did , Network rail, at Paddington will need to spend some serious money and sort out the terrible track conditions, and layouts , to sort out this situation, , as it seems ludicrous to provide a totally new Intercity fleet, and the other classes which I think are electrostatic, based on the pretty smooth riding class 170 diesels .
I recall riding on the 170's between , Stirling and Edinburgh, when they were new and they seemed to be very smooth , so I don't understand, why the electric versions are so bad ?. As for the track at Paddington, I don't think it was ever tackled when they electrified the line to wherever the wires end , out of interest, is it right that it's wired all the way to.south Wales , Grand Union mentioned Carmarthen ,as one of their stations I'm not sure if that's before Cardiff or further out , or their last station stop.
also how far does the electrification stretch, on the line toward the west country ?
 
Last edited:

stuu

Established Member
Joined
2 Sep 2011
Messages
3,771
In my experience IETs ride decently. 345s are a bit worse. 387s though are pretty shocking at speed, and even worse when coming into Paddington...
In the 40+ years that I can remember travelling by train, I have been on precisely one train where I thought something had gone seriously wrong, and other passengers around me started looking worried and even alarmed.

There is a vast inconsistency between IETs, but generally they ride terribly, and are worst at top speed in my experience
 

EIKN

Member
Joined
19 Sep 2017
Messages
113
Toward Newbury
Sorry not meant rude , but can you be more specific, surely it doesn't just randomly stop in the open countryside, does it not stop at a station ?, I can't think where Newbury is in relation to the west.
 

stuu

Established Member
Joined
2 Sep 2011
Messages
3,771
Sorry not meant rude , but can you be more specific, surely it doesn't just randomly stop in the open countryside, does it not stop at a station ?, I can't think where Newbury is in relation to the west.
It stops about 500m west of Newbury station. Newbury is about 20 miles south west (ish) of Reading
 

FGW_DID

Established Member
Joined
23 Jun 2011
Messages
3,035
Location
81D & 81E
Sorry not meant rude , but can you be more specific, surely it doesn't just randomly stop in the open countryside, does it not stop at a station ?, I can't think where Newbury is in relation to the west.

The OLE extends past Newbury Station (which is on the Berks & Hants line between Reading & Westbury), the live section finishes just on the Westbury side of Newbury Station, the OLE does extend a little further but this is a Permanently Earthed Section (PES).
 

YourMum666

Member
Joined
11 Nov 2019
Messages
281
Location
United Kingdom
Sorry not meant rude , but can you be more specific, surely it doesn't just randomly stop in the open countryside, does it not stop at a station ?, I can't think where Newbury is in relation to the west.
Just outside Newbury, 20 miles west of Reading. Right near bedwyn
 

FGW_DID

Established Member
Joined
23 Jun 2011
Messages
3,035
Location
81D & 81E
Sorry not meant rude , but can you be more specific, surely it doesn't just randomly stop in the open countryside, does it not stop at a station ?, I can't think where Newbury is in relation to the west.

To add further, yes the Wires effectively just randomly stop but the limit of electric operation is Newbury Station itself. IETs heading west on down trains, if stopping at Newbury, can switch to diesel mode during the station stop. Down trains not stopping change over power on the Reading side of Newbury Racecourse Station.
 

SargeNpton

Established Member
Joined
19 Nov 2018
Messages
1,744
I commute on the WCML out of London daily, and there is rarely any instance of the bumpiness compared to the GWML
In the late 1980s with Mk1 coaches riding on Commonwealth bogies, the WCML between Hanslope Junction and Wolverton was quite an exciting ride on the commute into Euston. Mk1s on BT10 bogies however ran much smoother over the same stretch.
 

EIKN

Member
Joined
19 Sep 2017
Messages
113
Hi guys thank you for the information about where the wires stop, Odd though as grand Union spoke of using ex LNER sets , however, having done some further reading , Grand Union indeed are and have approval to run a new class91/93, hauled Mark4 train to Carmarthen , eventually to be replaced by bi modes , they are in partnership with the Spanish train company Renfe among others .
They will also from next December start services from Stirling via Whiflet line , along the west coast main line to Euston , again it's approved and will be class 91',and class 93 hauled .
Which brings me back to something I had wrote, that GWR would be an ideal operator to run Cross country services, in competition, with the current cross country service, especially now they have ended with no suitable replacement, trains with the capacity needed for such long distance runs .
And as I read Gwr as well as LNER are seeking further Bimode trains,
And in days gone by in the British rail era , were photos of the ' westerns ' having operated to Leeds , we need more choice if they really do want to entice car users to take the train.
The grand Union offering looks very impressive.
Hence my question about the limit of electrified line heading west .
I don't know where the wires start again closer to the Welsh border , but having read that they will use class 93 locos , which are bi modes , solves the issue of the wires ending seemingly randomly at Newbury.
In an ideal world it would have been wired all the way to Penzance .
And the various branches from that line .
Thank you though for the information on the current situation with the electrified sections .
 

GC class B1

Member
Joined
19 Jun 2021
Messages
460
Location
East midlands
My experience comparing IET with HST is that IET bogies on GWML and ECML hunt on all types of track at various speeds depending on the condition of both the track and the bogies. HST sets don’t usually hunt as the bogies are designed to self centre and this reduces any tendency to hunt. IET and all modern vehicles have yaw dampers but the bogies aren’t self centring and these vehicles especially those with lightweight bogies are prone to bogie hunting. The yaw dampers are designed to stabilise the bogies but for reasons I don’t know don’t seem to prevent hunting. I believe the poor ride on HSTs is mainly due to inadequate damping especially the secondary vertical air suspension which doesn’t seem to have much damping in the air pipes.

== Doublepost prevention - post automatically merged: ==

In the late 1980s with Mk1 coaches riding on Commonwealth bogies, the WCML between Hanslope Junction and Wolverton was quite an exciting ride on the commute into Euston. Mk1s on BT10 bogies however ran much smoother over the same stretch.
Mk1 coaches didn’t have BT10 bogies (except from memory one catering vehicle that was fitted with BT5 bogies for testing purposes but had B4 and B5 bogies. Mk1 coaches with BR standard bogies were not good riding and very prone to hunting. I ride assessed many of them in my early days in the LMR coaching section in Derby.
 
Last edited:

stuu

Established Member
Joined
2 Sep 2011
Messages
3,771
... , solves the issue of the wires ending seemingly randomly at Newbury.
Newbury is where the frequent local service ends, so it's not particularly random. Beyond Newbury, there are a few local services to Bedwyn but it's mostly the long distance trains and freight
 

EIKN

Member
Joined
19 Sep 2017
Messages
113
My experience comparing IET with HST is that IET bogies on GWML and ECML hunt on all types of track at various speeds depending on the condition of both the track and the bogies. HST sets don’t usually hunt as the bogies are designed to self centre and this reduces any tendency to hunt. IET and all modern vehicles have yaw dampers but the bogies aren’t self centring and these vehicles especially those with lightweight bogies are prone to bogie hunting. The yaw dampers are designed to stabilise the bogies but for reasons I don’t know don’t seem to prevent hunting. I believe the poor ride on HSTs is mainly due to inadequate damping especially the secondary vertical air suspension which doesn’t seem to have much damping in the air pipes.

== Doublepost prevention - post automatically merged: ==


Mk1 coaches didn’t have BT10 bogies (except from memory one catering vehicle that was fitted with BT5 bogies for testing purposes but had B4 and B5 bogies. Mk1 coaches with BR standard bogies were not good riding and very prone to hunting. I ride assessed many of them in my early days in the LMR coaching section in Derby.
Sorry to ask another question, but what is ' hunting Bogies ', is that where the side to side motion , is not sufficiently controlled or dampened ?.
I notice on train Bogies ( and on my models ) that they have springs like a car, but huge ring shaped rubber devices , are they the air suspension?, if so is it possible for the makers to modify the amount of dampening , to improve the ride quality ? .
And I thought the yaw dampeners are the fault that they all have ( oddly including the CAF built units , Mark5 and class 195's ), I'm not sure the 196's or 197 or whatever the Welsh ones are called , but I know I'd readbthey had yaw dampner issues or some bracket , all prone to cracking and seemingly a major safety issue , should one fail at speed
 

Irascible

Established Member
Joined
21 Apr 2020
Messages
2,233
Location
Dyfneint
Sorry to ask another question, but what is ' hunting Bogies ', is that where the side to side motion , is not sufficiently controlled or dampened ?.

It's (very simplified) when the wheelset in a bogie has got upset enough that instead of the conical shape of the wheels keeping it properly aligned, a wheelset is bouncing off it's flanges back & forth across the track - the bogie is effectively turning left & right constantly. It's a combination of yawing and lateral movement relative to the body. It's not strictly limited to bogies, but there's not much 4W stock left to worry about. Effective damping should stop any oscillation building that far.
 

GC class B1

Member
Joined
19 Jun 2021
Messages
460
Location
East midlands
Sorry to ask another question, but what is ' hunting Bogies ', is that where the side to side motion , is not sufficiently controlled or dampened ?.
I notice on train Bogies ( and on my models ) that they have springs like a car, but huge ring shaped rubber devices , are they the air suspension?, if so is it possible for the makers to modify the amount of dampening , to improve the ride quality ? .
And I thought the yaw dampeners are the fault that they all have ( oddly including the CAF built units , Mark5 and class 195's ), I'm not sure the 196's or 197 or whatever the Welsh ones are called , but I know I'd readbthey had yaw dampner issues or some bracket , all prone to cracking and seemingly a major safety issue , should one fail at speed
Irascible has explained bogie hunting very well. The yaw dampers are fitted to provide a damping force acting against the bogie rotation to prevent hunting (which is high speed bogie rotation with wheelsets alternately moving across the track and wheel flanges contacting each rail) while still allowing the bogie to rotate to negotiate curves. The forces exerted on the yaw dampers will be high if the bogies hunt and I believe these high forces have lead to failure of the yaw damper mounting to the underframe. This problem is not new and class 158 yaw damper mountings had to be strengthened after problems were experienced in service.

The rubber elements you describe are air springs and support the vehicle body. These do not provide rotational resistance as their purpose is to permit the vehicle body to rotate freely on the bogies to negotiate curves. It would not be feasible to use these as yaw dampers.
 
Last edited:
Status
Not open for further replies.

Top