LOL PZ I very rarely get a seat on the train even with the belly rubbing. I'm on the train right now sitting between 2 ppl and the girl wouldn't move over or get up to let me in I had to haul my belly (and big bum) over her and hit the ppl in the seat in front...it makes me cross! I will get up to let everyone in regardless of being pg or not. Sorry bit off topic there!
That's why I rarely took a seat on the train. One day when I was a student I got stuck into a about 14 year old. he was on a seat and his bag on the other when 2 pg women were standing. I never took a seat as a student unless the train was really empty.