1938TS UNDMs; What were they like to operate?

[brigham]

Sept 17, 2020 12:53:35 GMT Chris M said:

I would hope that there was a solution for this designed in from the start. Wheeled car stands is my first thought.

It isn't a new concept. Gosforth have been doing it for years.

[jimbo]

Sept 16, 2020 11:30:36 GMT t697 said:

As far as I recall, uncoupling of S stock was not a design option progressed in any way at all......

Perhaps early S stock documentation was just 2009TS updated, and someone missed deleting the mention of a shunting control cabinet?

[jimbo]

Sept 18, 2020 7:34:07 GMT brigham said:

Sept 17, 2020 12:53:35 GMT Chris M said:

I would hope that there was a solution for this designed in from the start. Wheeled car stands is my first thought.

It isn't a new concept. Gosforth have been doing it for years.

I believe the Metro car layout is similar to DLR units, with two cars sharing a central bogie. If these were separated, a spare bogie could be slipped under the remaining car since there is space provided, of course. The coming Picc trains appear to have conventional two bogie cars at the odd-numbered positions, albeit with end single door area removed. They can stand alone if uncoupled. The shorter even-numbered cars hang from the cars either side, and have no bogies. Given the restricted under-floor space for equipment, there is probably no space to insert a temporary bogie. I can only imagine that temporary accommodation bogies could be used to take the place of an adjoining car, and the wheel-less car attached beside this. Bakerloo and Waterloo & City cars will need to move by road to Acton for heavy overhaul, so some solution for splitting trains will have to be developed. Picc trains can remain complete to work there by rail for overhauls, as can Central line trains and current S stock.

[Chris M]

Indeed, Metro cars and DLR units have the same bogie layout.

Far more common than the need to split units will be the need to lift units, to work on bogies, wheels or other under-floor equipment that cannot be done from a pit. For this purpose depots that lift DLR stocks have car stands that lift the whole train as a single unit. I believe there are four lifting points per car on S stock. If there are such points on every car of the new stock then those on the non-bogie cars could be used as attachment points for a supporting frame with wheels. It would not need to be powered, or even suitable for anything other than very low speed movements within depots so even wheels the size of those on wheel skates may suffice.

I note though that this is getting very off topic for a discussion of 1938 stock (and apologise for my part in that), so perhaps a passing mod or admin would be kind enough to split the thread?

[jimbo]

Sept 14, 2020 11:56:07 GMT jimbo said:

Sept 14, 2020 11:15:08 GMT metman said:

Demonstration cars were two ex 1935 tube stock driving motor cars which had been withdrawn from service form the Central Line shuttles.

Of course, there wouldn't have much space left with a couple of standard stock back to back, with the equipment compartments! Sorry! photo here

Was the intention to have a train of four of these pairs, or was it just a demo for the articulation concept, and the train would have two halves of four cars with only conventional bogies at the outer ends of each half?

[jimbo]

Sept 17, 2020 18:43:38 GMT johnlinford said:

How often are modern trains like the S stock split up in to individual cars?

I believe S stock trains would normally be kept complete and lifted in workshops as a full train. However, 3 S7 were lengthened to S7+1 for Met service, later shortened to S7 for CBTC modification, and then one was again lengthened to S7+1. I believe this was all done at Bombardier.