I don’t know what it is but I feel like there is something especially enjoyable about reading on a train or bus. Like I would be fine with making my commute longer because it dosen’t feel like wasted time since I am reading. Also its just nice to be stuck somewhere for a bit with nothing to do but wait and be forced to read.
I have the same but with podcasts & cycling. It’s quality time for me and I’m often willing to make it last a little longer.