Class 175s to GWR

[BillStampy]

Oh, that's what I saw by chance at Reading...

View attachment 204235

 

[REVUpminster]

175113 at the third attempt to Laira today.

Ely :3: 175005/008, 175104 (175008 is in two halves)

Wolverton :10 : 175004, 175102/103/105/106/107/108/109/110/116

Laira : 13: 175002/007/009, 175114 ex Ely; 175001/003/006/011, 175101/111/112/113/115 ex Wolverton

Long Rock : 1 : 175010 ex Ely

as of 15 May 2026

 

[XFeed]

The 175s have Voith T211 2-speed/2-stage hydraulic transmissions, like 15x/16x/170s/171s. With the 175s having final drives geared for 100mph (like 168s/170s/171s), I don't think they change up until about 65-70mph.

175s don`t have a gearchange as such although it sounds like it does. Engine torque is transmitted through the converter into the gearbox up to a speed of 60mph and at this point the Lock up clutch is engaged and it`s this Lock up clutch activation that makes it sound like a gear change.

== Doublepost prevention - post automatically merged: 15 May 2026 ==

Oh, that's what I saw by chance at Reading...

View attachment 204235

Looking through the drivers windscreen into the cab you can clearly see the DAS - Drivers Advisory Screen - still fitted to the centre pillar whereas in post #2740 showing the inside of the cab of 001 at Laira it has been removed.

 

[tfw756rider]

175s don`t have a gearchange as such although it sounds like it does. Engine torque is transmitted through the converter into the gearbox up to a speed of 60mph and at this point the Lock up clutch is engaged and it`s this Lock up clutch activation that makes it sound like a gear change.

== Doublepost prevention - post automatically merged: 15 May 2026 ==

I know, but you know what I mean

 

[XFeed]

I know, but you know what I mean

I do as you seem to have a pretty decent grasp of things

 

[Apedlar12]

Allocations are up for tomorrow:

175003
2C06/2E13/2C32/2P28

175007 5N08/2N08/2N09/2N16/2N19/2N22/2N23/2N26/2N27/5P27

175112
2C20/2E17/2P36

Subject to change of course.

 

[BillStampy]

Allocations are up for tomorrow:

175003
2C06/2E13/2C32/2P28

175007 5N08/2N08/2N09/2N16/2N19/2N22/2N23/2N26/2N27/5P27

175112
2C20/2E17/2P36

Subject to change of course.

Let it begin! First operations for the Class 175 fleet in service on the Newquay branch and in operation on a Sunday since October 2023! (I don't think any units have been active on Sunday yet up to this point!)

 

[RPI]

I see it's already a farce at Saltash.....

 

[tfw756rider]

I see it's already a farce at Saltash.....

What do you mean?

 

[pokemonsuper9]

What do you mean?

Looks like 175003 has broken down.

This service was cancelled between Saltash and Penzance due to a problem with the train (M8).

Realtime Trains | 2C06 0845 Plymouth to Saltash | 17/05/2026

Real-time train running information for 2C06 0845 departure from Plymouth to Saltash on 17/05/2026. From Realtime Trains, an independent source of train running info for Great Britain.

www.realtimetrains.co.uk

And either 175007 was cancelled to rescue it, or broke down too in the same place

This service was cancelled between Saltash and Par due to a problem with the train (M8).

Realtime Trains | 5N08 0859 Plymouth to Saltash | 17/05/2026

Real-time train running information for 5N08 0859 departure from Plymouth to Saltash on 17/05/2026. From Realtime Trains, an independent source of train running info for Great Britain.

www.realtimetrains.co.uk

 

[Apedlar12]

Looks like 007 operated an additional passenger service from Saltash down to Par, instead of going down as an ECS (originally planned).

Guess that might have been done to get the stranded passengers from 003 a bit further along...

114 is now allocated to take over 003's diagram at Plymouth on 2E13.

 

[BillStampy]

175112 has now sat down at St Germans, oh dear.

 

[Apedlar12]

Failed as well.

Gone back to Laira now via an ECS.

 

[REVUpminster]

175007 did not go to Wolverton, 175003 did! I am not going to get my car MOT'd there.

175114 didn't go to Wolverton.

 

[Apedlar12]

175011 has now gone down to Par from Laira to start 2E13 there (replacing 112).

Edit: Looks like 111 will be making its debut tomorrow.

 

[XFeed]

It`s pretty obvious that I have a little bit of interest in the fortunes of 175s in their new home and I would like to see them succeed and I`m quite surprised with the number of problems that they have encountered and I suppose that could partially be down to the length of storage ?

The start of today wasn`t great by the looks of it with RTT reporting 003 failing due to a problem with the train and 112 with a safety system fault.

Does anyone have any further information of the 2 train faults or which safety system was at fault ?

 

[Russel]

Is there a common reason behind the multitude of failures we're seeing?

 

[XFeed]

Is there a common reason behind the multitude of failures we're seeing?

Unfortunately we don`t know the exact nature of the failures whether they have all been different or re occurring is unknown.
Initially they did have regular door faults but appears that they have gone away now that the train crews are getting used to the units

 

[Jrocks]

It`s pretty obvious that I have a little bit of interest in the fortunes of 175s in their new home and I would like to see them succeed and I`m quite surprised with the number of problems that they have encountered and I suppose that could partially be down to the length of storage ?

The start of today wasn`t great by the looks of it with RTT reporting 003 failing due to a problem with the train and 112 with a safety system fault.

Does anyone have any further information of the 2 train faults or which safety system was at fault ?

003 was engine issues

112 was TMS issues (similar to what we saw back along with this unit in Penzance)

 

[XFeed]

003 was engine issues

112 was TMS issues (similar to what we saw back along with this unit in Penzance)

Hi and thanks for providing some details, its much appreciated.

Did 003 have both cars engine issues as 2 car 175s will happily run on 1 engine albeit lose some time.

TMS issues do occur but can be varied reasons depending on the symptoms, TMS will not configure faults usually occur when unit is worked coupled to another unit but 112 wasn`t today also the TMS can display numerous spurious faults continually especially if the unit hasn`t been "Tripped" for more than 24 hrs also if the driver enters a TSN - Train Service Number - at speed and even a slow speed the TMS will spit its dummy out eventually, sometimes straight away but can also be at least an hour later.

Incidentally in our time at Chester the TMS was classed as a driver information system and not a safety system which I found to be totally bizarre !

 

[RPI]

Is there a common reason behind the multitude of failures we're seeing?

I think it's a combination of the period of time in storage/not being used regularly and crew familiarisation.

 

[Harpo]

I think it's a combination of the period of time in storage/not being used regularly and crew familiarisation.

Let’s hope the same doesn’t happen to the 350s when they become the next barn find fleet.

 

[Ashley Hill]

Did 003 have both cars engine issues as 2 car 175s will happily run on 1 engine albeit lose some time

I understand that a 175 only has one compressor, so if that engine fails it’s game over.

 

[Siemens Staines]

I think that this may be the first day in passenger service with GWR for 175111. Apologies if it has worked previously and I missed it.

Realtime Trains | 2C05 0655 Exeter St Davids to Penzance | 18/05/2026

Real-time train running information for 2C05 0655 departure from Exeter St Davids to Penzance on 18/05/2026. From Realtime Trains, an independent source of train running info for Great Britain.

www.realtimetrains.co.uk

 

[Bikeman78]

I understand that a 175 only has one compressor, so if that engine fails it’s game over.

The good engine can cross feed to keep the compressor and other important systems going on the other vehicle.

 

[fgwrich]

Let’s hope the same doesn’t happen to the 350s when they become the next barn find fleet.

Porterbrook has been busy electrifying Long Marston so they should be ok. On a side note I still find it crazy that there’s a small fleet of ex HEX 360s parked up in South Wales.

 

[XFeed]

I understand that a 175 only has one compressor, so if that engine fails it’s game over.

Yes you are correct that 175s only have one compressor and that is fitted to the 50 car but its not always game over if there`s an engine or cooler group issue, as Bikeman78 has pointed out, the adjacent car will cross feed 3 phase power across to the affected car and that`s pretty straight forward for a 2 car.

3 cars are slightly more of a problem in regards to cross feeding as cars can only cross feed to adjacent cars so in the scenario of the 56 car engine not running it will be cross fed from either the 50 or 79 cars so if the 50 car then develops an engine or cooler group fault no cross feed to it is available as the 56 car is not running. Its then a dead duck.

Compressors are driven by a 3 phase motor.

 

[Railperf]

That seems a serious design flaw. How often did that scenario happen when running for TFW?

 

[REVUpminster]

Looking at the branch service in Devon and Cornwall to see if any effect by the 175s. 175006 operating successfully as the extra train to Newquay. Two shortforms on Paignton Exmouth; Barnstaple has a 166217 on the busy train instead of two 150 units. 13/17 150s operating including two units to St Ives. Only 4 turbos operating. Perhaps they need a second 175 on the Newquay branch.

175114 and 175007 working services HSTs did (I might have missed another one). Not a great return on 13 trains at Laira although some may have been cannibalised.

 

[RPI]

Looking at the branch service in Devon and Cornwall to see if any effect by the 175s. 175006 operating successfully as the extra train to Newquay. Two shortforms on Paignton Exmouth; Barnstaple has a 166217 on the busy train instead of two 150 units. 13/17 150s operating including two units to St Ives. Only 4 turbos operating. Perhaps they need a second 175 on the Newquay branch.

175114 and 175007 working services HSTs did (I might have missed another one). Not a great return on 13 trains at Laira although some may have been cannibalised.

They can't have a second 175 on the Newquay, something to do with some crews not signing them (yet)