In message , Boltar
writes

No. Usually roughly every 2nd car has its own motors but on the 1992
stock on the central line every car has motors.
It's a long time since I worked on the tube, but both "38" and "62"
stock had six out of eight cars as motor cars( that is driving the
train) whilst the non motor cars had the compressors underneath them.
Cars with driving facilities were usually two a train, making two
individual sets driven(operated)from the front.
--
Clive.