I used to see Biden at Union Station regularly but usually only on Friday afternoon. I commuted every day (from Baltimore). My impression was he stayed in Washington through the week and went home on the weekends. I could be wrong about this. Back then, he rode the Metroliner.
How long is the train ride ?
I’d estimate that his commute may equal or be shorter than some inter Washington travel by car.
In any case the working man persona seems to be the major strength they are trying to create.