Crossword puzzles? I used to get the earliest train out of South Attleboro (back when it was open) so I could sit at a table and work using the wifi. If I was lucky I could work on the way home, too. (It was a demanding job and if I'm being 100% honest, that's part of why the commute sucked. There was no downtime. So that will differ for other kinds of jobs.)

It's also lucky to be able to take calls from the car and not have to a.) look at a screen or b.) take notes. That would not be true for a lot of people.