Passenger Train Lengths

 https://jfdatalinks.blogspot.com/search?q=Passenger+Train+Lengths

Train length	4-car: 82.87 m (271 ft 11 in) 5-car: 102.86 m (337 ft 6 in)
Car length	DM vehs.: 21,446 mm (70 ft 4 in) Others: 19,990 mm (65 ft 7 in)

https://en.wikipedia.org/wiki/British_Rail_Class_710#Operation 68' or 67.5' x 4 or 5 car trains.

Train length	S7: 117.45 m (385 ft 4 in) S8: 133.68 m (438 ft 7 in)
Car length	17.44 m (57 ft 3 in) (DM) 15.43 m (50 ft 7 in) (NDM)

https://en.wikipedia.org/wiki/London_Underground_S7_and_S8_Stock

Selective door operation (SDO) is used at some stations where the platform is shorter than the train, such as at Baker Street https://en.wikipedia.org/wiki/London_Underground_S7_and_S8_Stock#Features

Train length	101.350 m (332 ft 6.2 in)
Car length	DMOS vehs.: 19.995 m (65 ft 7.2 in) Others: 19.660 m (64 ft 6.0 in)

https://en.wikipedia.org/wiki/British_Rail_Class_378#Design_and_features