Many Swiss stations are "stub ended": Zurich and Luzern i.e.
At one time for these two they had to bring in an engine to attach to the rear (which is now the front)
; but now most trains have an engine in front and back, but the "motorman" must walk the length of the train, so 7 minutes (or more) is normal from arrival to departure.
In some systems (such as the Victoria line in London) "stepping back" is used for faster turnarounds - when a train arrives at a terminus station, the driver for the reverse journey is already waiting at the "back" of the train, which becomes the front. The train then moves off while the previous driver is walking the length of the train.
Some systems have drivers at both ends of trains all the time so they can take it in turns to drive and rest.