Harlesden
Member
I've been reading about the Grimsby-South Wales fish trains and there is reference to four or five swingers behind the guards van being dropped off at Nottingham. Unfortunately, there is no further explanation.
I always understood that on the Southern, because it had a preference for having coaches in sets, swingers were carriages not allocated to sets. They could then be added to trains for strengthening purposes. I don't think that that affected braking, though.