Hi II, thanks for the reference. I understood from that thread that all 3 carriages were in use with the last having the doors locked but still having passengers in it. I was thinking of not having passengers in that carriage at all so the train would run with only two carriages in use. This should satisfy
H&S▸ as the doors in the carriages that were in use would be fully operational.
I see what you mean, but if the rear carriage locked out of use was the one with the emergency equipment in it then passengers would not be able to access that equipment in an emergency. That is enough to prevent it on H&S grounds.
Also, on the Cotswold Line Turbo services, because the driver operates the doors each time after receiving permission from the Conductor, the Conductor has to be positioned in the rear cab of the train to give the buzzer codes, and so every time he/she needed to move into the occupied part of the train, the internal doors would have to be unlocked and then locked again to allow them access. Cumbersome to say the least.
I remain of the opinion that I stated at the beginning of this thread as the best compromise to the problem.
Hopefully any new rolling stock will be designed to be more flexible, with
SDO▸ , or a door de-select feature (as on Chiltern's Clubmans).