> Caltrain replaced all their track about 15 years ago, going to concrete ties and welded rail. I live there. I took it to work for 6 years. (I stopped late la

> Caltrain replaced all their track about 15 years ago, going to concrete ties and welded rail. I live there. I took it to work for 6 years. (I stopped late last year.) The ties are mostly wood. There's some concrete ones in and around some stations, but the vast majority are wood. Edit: https://www.youtube.com/watch?v=_s9HcflA_nY https://www.youtube.com/watch?v=_s9HcflA_nY — there are more than I thought there were, but definitely not all of them.