Flying fucking spaghetti monster! This is a post posted in the community "Fuck Cars" everything here has to do with cars! More specifically, this post criticises cars for their bad environmental impact, contrary to other modes of transportation illustrated in the post.
The problem with this community is that it has two sides. One that wants people oriented design and one that just wants to rant "fuck cars!" I understand how it came to be named what it is but it is unfortunate for the greater cause.
Depends on the train obviously, but a lot less than cars at anywhere close to capacity. Why do you ask? Just look at the Wikipedia page for whichever rolling stock you were thinking of.
I'm just genuinely confused what your point is. The weight of a passenger train per passenger is meaningless. I was vaguely curious that my local EMUs are 200-600kg depending on which capacity figure you use, but that information is of no use to me.