Actual 377 and 387 Cascades (GN, SN, SE)

[TT-ONR-NRN]

GTR Class 377/387 cascade updates 2026

Thanks @bramling I really think train interior design should first undergo a "common blimmin' sense..." check from this forum's members. :) I recall Siemens class 450 initially had first class toward the middle of one trailer car. Very same effect - people walking through first, to use the...

www.railforums.co.uk

The above thread is in Speculative Discussion, and I get why as there is a lot of speculation in it.

However, I would like to actually keep track of the actual transfers of 387s from Great Northern to Southern, and subsequently 377s from Southern to Southeastern, and it has now happened, so I've made this thread for actual reports of these transfers.

Does anyone have a list of all of the units that have transferred so far please?

 

[stadler]

GTR Class 377/387 cascade updates 2026

Thanks @bramling I really think train interior design should first undergo a "common blimmin' sense..." check from this forum's members. :) I recall Siemens class 450 initially had first class toward the middle of one trailer car. Very same effect - people walking through first, to use the...

www.railforums.co.uk

The above thread is in Speculative Discussion, and I get why as there is a lot of speculation in it.

However, I would like to actually keep track of the actual transfers of 387s from Great Northern to Southern, and subsequently 377s from Southern to Southeastern, and it has now happened, so I've made this thread for actual reports of these transfers.

Does anyone have a list of all of the units that have transferred so far please?

I know that these units have definitely transferred so far:

GN to SN:
387 123
387 126
387 128
387 129
387 302

SN to SE:
377 121
377 122

There was also a GWR livery 387 at Lovers Walk recently but i notice that has gone back to GN for now.

 

[bramling]

I know that these units have definitely transferred so far:

GN to SN:
387 123
387 126
387 128
387 129
387 302

SN to SE:
377 121
377 122

I believe that’s still the current state of play. 387101 is out for ETCS project works, and I believe 387107 is stopped.

 

[jammmmmsssssss]

I believe that’s still the current state of play. 387101 is out for ETCS project works, and I believe 387107 is stopped.

Why is 387107 stopped?

 

[bramling]

Why is 387107 stopped?

ISTR damage from a fatality incident. It’s been OOS for a good few months now.

 

[jammmmmsssssss]

ISTR damage from a fatality incident. It’s been OOS for a good few months now.

Thanks. 387101 has been out for its ETCS fitment for years now

 

[Islineclear3_1]

So no more 377/1's from Southern?

 

[D365]

Thanks. 387101 has been out for its ETCS fitment for years now

”First in Class” fitments are never quick. 66039 and 67002 have been stood down for nigh-on two years with no sign of returning to mainline operation in the near future.

To bring it back to the 387s - is it known how many of units 102-129 will additionally be fitted with Alstom ETCS at this time?

 

[TT-ONR-NRN]

So no more 377/1's from Southern?

They're not all going over...

 

[St. Paddy]

”First in Class” fitments are never quick. 66039 and 67002 have been stood down for nigh-on two years with no sign of returning to mainline operation in the near future.

To bring it back to the 387s - is it known how many of units 002-029 will additionally be fitted with Alstom ETCS at this time?

101-113

 

[D365]

101-113

Thanks. And I have amended my original post to cite the correct subclass.

 

[stadler]

Unit number 387 120 has just transferred to Southern and is currently at Selhurst depot. The brings it to 5× 387/1s and 1x 387/3s that Southern currently have.

 

[Sutton in Ant]

So no more 377/1's from Southern?

In total, Southeastern Railway will be getting 13 377s 121 - 133 from Southern Railway.

 

[St. Paddy]

Unit number 387 120 has just transferred to Southern and is currently at Selhurst depot. The brings it to 5× 387/1s and 1x 387/3s that Southern currently have.

It’s out on the GN today and still branded as such

 

[stadler]

It’s out on the GN today and still branded as such

Yes it has gone back again. It was only at Southern for about a week. I am guessing it only went to Selhurst to have work done rather than a transfer.

 

[stadler]

387 301 and 387 305 arrived at Lovers Walk from Great Northern earlier today. They are currently stabled at Lovers Walk depot. So that means that three (these two along with 387 302 which transferred a while ago) of the 387/3s are at Southern now.

 

[Class455]

377129 transferred to Southeastern this weekend.

 

[stadler]

377129 transferred to Southeastern this weekend.

There are five 377/1s that have transferred to Southeastern now:

377 121
377 122
377 127
377 129
377 130

So just eight more to go until all thirteen of them are transferred.

 

[brad465]

There are five 377/1s that have transferred to Southeastern now:

377 121
377 122
377 127
377 129
377 130

So just eight more to go until all thirteen of them are transferred.

Southeastern talked about introducing 8 in this weekend's timetable change, suggesting another 3 will come over imminently, with the remaining 5 between then and December.

 

[47444]

Is the shed allocation of the Southeastern 377s available/known?

My understanding is that the 377/5 (ex Thameslink units) remained allocated to Selhurst after their move to SE (due to maintenance time availability at Selhurst).

So two questions flow:

• Are the 377/5 still based at SU?
• Are the recently transferred 377/1 also still based at SU or somewhere else (presumably SG or RM)

TIA

 

[Peter Mugridge]

The 377/5 are allocated to Ramsgate but get serviced at Selhurst.

Not sure about the 377/1s that have moved over, but I'd imagine the same applies.

 

[47444]

The 377/5 are allocated to Ramsgate but get serviced at Selhurst.

Not sure about the 377/1s that have moved over, but I'd imagine the same applies.

Thank you

 

[Class455]

387305 in service this morning on 1F06 07:16 Vic-Eastbourne

 

[stadler]

387305 in service this morning on 1F06 07:16 Vic-Eastbourne

387 301 has also entered service now. It is on a Brighton to Southampton currently.

387 306 also just transferred from GN to SN too. It is stabled at Stewarts Lane depot currently.

So that means 301 / 302 / 305 / 306 are all at Southern now. Just 303 / 304 left to transfer and then all 387/3s will be moved.

 

[Minstral25]

Yesterday passed two 377s they have been parked in the sidings at Haywards Heath, went past too fast to get numbers but could they be 377/1 for SE being stored until transfer or are they there for some other reason?

 

[stadler]

Yesterday passed two 377s they have been parked in the sidings at Haywards Heath, went past too fast to get numbers but could they be 377/1 for SE being stored until transfer or are they there for some other reason?

That is 377 114 and 377 471 that you saw. They arrived yesterday morning and are still there now. None of those two are going to Southeastern so they are there for another reason.

 

[RichJF]

387305 in service this morning on 1F06 07:16 Vic-Eastbourne

Will be hoping to get a 387/3 when I get that train (possibly twice) next week!

 

[Class455]

387127 and 387306 in service on tonight’s 1J93 18:03 London Bridge to Bognor

 

[D3WY]

377 123 and 126 are in process of being transferred to SE

 

[Class455]

387119 and 387121 moved over to Southern yesterday afternoon.