I was watching a train simulator video on You Tube of a 321 EMU between Wickford and Southminster, I line I knew well in my youth.
I noticed that the power controller was put to 4 to accelerate then moved to 0, and when speed dropped a little it was back to 4 for a few seconds.
Is that the usual way to maintain speed ?
https://www.youtube.com/watch?v=K6DkNDul0H4