• 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!

Transport for Wales Class 231 / 756 Stadler FLIRTs

Cardiff123

Established Member
Joined
10 Mar 2013
Messages
1,662
Location
South Wales
To be fair, Bikeman has a fair point. As much as Penarth is a well used route, it's very short compared to Barry and more. Preferably you'd put the Barry's as 231s as I believe they fill up more. I'm not 100% sure on this but it'd make more sense.
Yes, I agree, the 231s are much better utilitised on the Barry route. Penarth has inadvertently benefitted over the years of being paired with the Rhymney line, which has historically had the longest trains on the Valleys, from doubled up Pacers to the 769s and recently the 231s.
But of the two lines in the Vale, the Barry line has always needed the longer trains.
 
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

AdamWW

Established Member
Joined
6 Nov 2012
Messages
6,022
There is only one diesel engine on a 756, compared with four on a 231. They are not designed to run any great distance on diesel.

It's not obvious to me that this follows.

I would assume they run like a hybrid road vehicle where the battery is charged from the diesel (and from dynamic braking?) rather than running the battery flat then going over to diesel power as an emergency power source.
Not quite a fair comparison I realise, but I believe a (non plug in) hybrid double decker bus can run from a car engine (1.9 litre engine vs 7 litre).
Also (putting the higher speed of a 231 aside), a 231 seems to be somewhat overpowered because a 3 car FLIRT (755/3) only has two engines (of the same type as a 756, I believe).
So now it's just a factor of two.
The 231s will of course travel significant distances without overhead power, so if the intention is that they need lots of time under the wires to charge the batteries sufficiently to get to Bridgend and back, it's going to make life hard if disruption means they have to turn round at Cardiff, and they won't be able to manage a shuttle service on part of the VoG during engineering works as they are today next weekend.

Four trains per hour to Bargoed, two to Rhymney.

Assuming we're not at cross purposes, has this descope been officially announced?
A month ago TfW were saying (https://news.tfw.wales/news/june-2024-timetable-change#:~:text=Metro Changes,and Merthyr to/from Cardiff.)
The changes are the next step in the creation of the South Wales Metro, which will eventually see 4 trains per hour from Treherbert, Aberdare, Rhymney and Merthyr to/from Cardiff.

My comments on 231 diagrams were aimed at their eventual use on the mainline.

Yes I got confused for a moment and forgot that the 231s are temporary.
 
Last edited:

Bikeman78

Established Member
Joined
26 Apr 2018
Messages
6,197
There was confected outrage in a local Penarth Facebook group last week from a Conservative councillor stating it was outrageous that "Labour-run TfW" were short changing Penarth passengers and treating them as second class citizens by taking away their new trains...........:rolleyes:

Meanwhile today it's now all 231s to Barry Island, 1 x 150 to Bridgend via VoG, and 2 x 153s on the new Sunday Penarth - Queen Street shuttle. Outrageous indeed. :rolleyes:
If someone's biggest problem in life is having to endure a 153 for 15 minutes then they are doing all right in my opinion.

== Doublepost prevention - post automatically merged: ==

It's not obvious to me that this follows.

I would assume they run like a hybrid road vehicle where the battery is charged from the diesel (and from dynamic braking?) rather than running the battery flat then going over to diesel power as an emergency power source.
Not quite a fair comparison I realise, but I believe a (non plug in) hybrid double decker bus can run from a car engine (1.9 litre engine vs 7 litre).
Also (putting the higher speed of a 231 aside), a 231 seems to be somewhat overpowered because a 3 car FLIRT (755/3) only has two engines (of the same type as a 756, I believe).
So now it's just a factor of two.
The 231s will of course travel significant distances without overhead power, so if the intention is that they need lots of time under the wires to charge the batteries sufficiently to get to Bridgend and back, it's going to make life hard if disruption means they have to turn round at Cardiff, and they won't be able to manage a shuttle service on part of the VoG during engineering works as they are today next weekend.
I'm not sure exactly how the 756s will work. My understanding is that they will do Cardiff to Bridgend and back on battery. I'm not sure what role the diesel engine will play. Will it run every time a train goes to Bridgend or only when there is disruption? Clearly one engine will be enough to keep toilets, lights and heating working. I expect it could go a fair way but who knows how the software is set up.

== Doublepost prevention - post automatically merged: ==

Assuming we're not at cross purposes, has this descope been officially announced?
A month ago TfW were saying (https://news.tfw.wales/news/june-2024-timetable-change#:~:text=Metro Changes,and Merthyr to/from Cardiff.)
Fair enough. Four trains an hour to Rhymney will be tight. Tirphil to Rhymney start to stop is 7.5 minutes uphill and 7 minutes downhill.
 
Last edited:

SWRail

New Member
Joined
22 Nov 2023
Messages
2
Location
Cardiff
Quite away I’d have thought. Needs enough 756’s into service to release 231’s to work those services. At present there’s no 756’s at all in service and doesn’t seem to be like it will be soon either.
756 Training for drivers and guards commenced today, it will take roughly 4/5 weeks. 1 Day for drivers and 1/2 day for guards.
 

TT-ONR-NRN

Veteran Member
Joined
30 Dec 2016
Messages
12,892
Location
Cambridge
756 Training for drivers and guards commenced today, it will take roughly 4/5 weeks. 1 Day for drivers and 1/2 day for guards.
That’s poor considering they were supposed to enter service on TAM around now. Still, it remains worth doing as surprise surprise, the date for 398s has slipped from November to early 2025.
 

1D54

Established Member
Joined
1 Jun 2019
Messages
1,482
756 Training for drivers and guards commenced today, it will take roughly 4/5 weeks. 1 Day for drivers and 1/2 day for guards.
So what have all these nightly trips to Cheltenham / Gloucester been about for the last few months, mileage accumulation maybe?
 

Jacob Didcote

Member
Joined
27 Mar 2019
Messages
206
Location
Barry
Think the 231s are well suited on the Barry Island runs...considering the 1849 run to Caerphilly last night was a wedgex...just as well a 150 wasn't on that turn!


1717431880948.png
 

craigybagel

Established Member
Joined
25 Oct 2012
Messages
5,829
That's for those who already sign 231s I presume?
Correct, it's a conversion rather than training from scratch.
That’s poor considering they were supposed to enter service on TAM around now. Still, it remains worth doing as surprise surprise, the date for 398s has slipped from November to early 2025.
Getting ~200 people trained in 5 weeks is quite an achievement. And it's best got out of the way now as if you wait any longer you'll be getting into school holidays when it's a lot harder to free up staff for training.
 

Lurcheroo

Established Member
Joined
21 Sep 2021
Messages
1,241
Location
Wales
Think the 231s are well suited on the Barry Island runs...considering the 1849 run to Caerphilly last night was a wedgex...just as well a 150 wasn't on that turn!


View attachment 159415
I tend to keep an eye on the internal systems for services reported as full and standing just out of curiosity.

I notice virtually every day in recent times there are multiple reports of services to and from Barry island over crowded with single 150’s. Today not one report on full and standing services on the core valley lines. So the 231’s certainly seem to be serving Barry island well. Let’s hope it continues.
 

Krokodil

Established Member
Joined
23 Jan 2023
Messages
6,615
Location
Wales
I notice virtually every day in recent times there are multiple reports of services to and from Barry island over crowded with single 150’s. Today not one report on full and standing services on the core valley lines. So the 231’s certainly seem to be serving Barry island well. Let’s hope it continues.
The kids are back at school now which helps. The real test will be the next sunny Saturday.
 

SWRail

New Member
Joined
22 Nov 2023
Messages
2
Location
Cardiff
So what have all these nightly trips to Cheltenham / Gloucester been about for the last few months, mileage accumulation maybe?
I have no idea, I'm not involved in any of the training or implementation, it's just what I have been told by guards.
But it does make sense considering the new time table can not be completed on 15x on the CVL, since Sunday, it has been almost impossible to keep time never mind make up time on any service on the Aberdare to Merthyr Services.
 

Buzz68

Member
Joined
4 Sep 2017
Messages
140
Location
Caerphilly, South Wales
Early hours of Saturday morning 1 June 5Q00 ran from Canton to Caerphilly and returned as 5Q01. Just curious what this might have been if any kind person knows, please. I was wondering if it might have been a 756?? Thanks
 

Richard Scott

Established Member
Associate Staff
International Transport
Railtours & Preservation
Joined
13 Dec 2018
Messages
4,584
I’ve believe it’s 400 miles. The longest diagram is 300 miles.
What is their fuel capacity? Would imagine they're not the best with regards to fuel consumption?
 

800301

Member
Joined
29 Dec 2022
Messages
542
Location
Essex
I’ve believe it’s 400 miles. The longest diagram is 300 miles.
Thanks, I’m not sure if I’m surprised or not, those V8’s must be thirsty but clearly the plan wasn’t for these to be used on any sort of long distance diagram.
 

Envoy

Established Member
Joined
29 Aug 2014
Messages
3,158
Thanks, I’m not sure if I’m surprised or not, those V8’s must be thirsty but clearly the plan wasn’t for these to be used on any sort of long distance diagram.
The plan is to use them on the Cheltenham to south Wales route. Goodness knows why they weren’t ordered as bi-modes being as Severn Tunnel Junction to Cardiff is already wired.
 

Krokodil

Established Member
Joined
23 Jan 2023
Messages
6,615
Location
Wales
The plan is to use them on the Cheltenham to south Wales route. Goodness knows why they weren’t ordered as bi-modes being as Severn Tunnel Junction to Cardiff is already wired.
What's the diesel range of a 756 though.
 

Trainbike46

Established Member
Joined
18 Sep 2021
Messages
4,380
Location
belfast
What is their fuel capacity? Would imagine they're not the best with regards to fuel consumption?
If they're like the 755s, they will have very small fuel tanks - maybe @dk1 knows the volume, at least for the 755s

Why do you think they'd be less fuel efficient than other DMUs?
 

Lurcheroo

Established Member
Joined
21 Sep 2021
Messages
1,241
Location
Wales
Why do you think they'd be less fuel efficient than other DMUs?
If I had to guess, I would think they’d be a bit better on fuel as new trains are a lot lighter than older ones.

I suspect they think so due to the 3 V8 engines that the 231’s have.
 

dk1

Veteran Member
Joined
2 Oct 2009
Messages
19,902
Location
East Anglia
If they're like the 755s, they will have very small fuel tanks - maybe @dk1 knows the volume, at least for the 755s

Why do you think they'd be less fuel efficient than other DMUs?

Sorry I don’t personally know the fuel capacity but they tend not to last more than a day without refuelling and seem to not like allowing them to fall below 30% in normal operation.
 

Nick Ashwell

Member
Joined
20 Dec 2018
Messages
463
Sorry I don’t personally know the fuel capacity but they tend not to last more than a day without refuelling and seem to not like allowing them to fall below 30% in normal operation.
Without the knowledge you have I guess something around that would be normal for a DMU/DEMU as you wouldn't want to risk it? For comparison I know the old HMS Ark Royal (before the previous one) kept her tanks above 50% to avoid the chance of issues and I would assume (dangerous I know) that no planner wants to risk it
 

dk1

Veteran Member
Joined
2 Oct 2009
Messages
19,902
Location
East Anglia
Without the knowledge you have I guess something around that would be normal for a DMU/DEMU as you wouldn't want to risk it? For comparison I know the old HMS Ark Royal (before the previous one) kept her tanks above 50% to avoid the chance of issues and I would assume (dangerous I know) that no planner wants to risk it

With the second generation DMUs we always capped it at 1500 miles but control would permit 1750 in extreme circumstances.
 

800301

Member
Joined
29 Dec 2022
Messages
542
Location
Essex
With the second generation DMUs we always capped it at 1500 miles but control would permit 1750 in extreme circumstances.

Something that makes you wonder on IET’s is the fact they have fuel gauges on each tank that can be remotely monitored, along with a lot of other parameters and yet still been known to end up running out of fuel…
 

Bornin1980s

Member
Joined
4 Apr 2017
Messages
720
Thanks, I’m not sure if I’m surprised or not, those V8’s must be thirsty but clearly the plan wasn’t for these to be used on any sort of long distance diagram.
How do the new engines compare to the old Cummins engines in the 150s?
 

Buzz68

Member
Joined
4 Sep 2017
Messages
140
Location
Caerphilly, South Wales
Last night there were a 5Q20 to 5Q25 runs Canton to Pontypridd to Canton then 5Q26 to Bargoed 5Q27 back to Canton. I’m assuming this again is a 756 on test? Thank you if anyone knows.
 

Top