Just put in some small waterbars to catch and redirect the vomit (or, e.g., spilled drinks) off the train. For those who don't know, waterbars are what you see on hiking trails to divert rainwater.
Exactly. I think it's ok for other people to carry guns. I don't think it's ok for batshit crazy people to carry guns.
Despite their success in predicting long term change in human populations, the laws of psychohistory are notoriously ineffective when applied to the individual.