Stanier Suburbans from Dapol

[PLD]

Not sure how "loco in the middle" worked for the LMS system or if it was even possible.

It could be done but was rare.
As I understand it, change over from driving at one trailer to the other involved simply closing one valve and opening another. From what I've read elsewhere didn't the GWR system mean disconnecting one linkage and connecting the other??

[EtchedPixels]

Not sure how "loco in the middle" worked for the LMS system or if it was even possible.

It could be done but was rare.
As I understand it, change over from driving at one trailer to the other involved simply closing one valve and opening another. From what I've read elsewhere didn't the GWR system mean disconnecting one linkage and connecting the other??

I believe so.

Alan

[madchadbrad]

Any evidence that a "non-driving" BT might have been through fitted for push-pull?

Certainly none built motor fitted, and none listed in the known conversions.
I can't see there would be a need for non-driving brakes - The driving trailers were all brakes, and they weren't intended for routes with high demand for luggage space needing a second van in a two/coach train.

Thanks! I asked because I was thinking of expressing interest in an example of each coach type so: BT, 3rd, fitted comp, DBT. I could run them as a standard 4 coach loco fwd train and then discard the BT & 3rd if using them as a push pull set. For my locos that are suitable they would be BR lined maroon; I don't have any pre-nationalisation locos that would fit.