When I took an Amtrack train a long time ago, smoking was permitted but only in the bar car.
Input text: a 10 foot wide dull wall. it is 10 foot tall [smoke]. the wall is -8 feet above and -10 feet behind a 12 foot tall shiny train. a man is 12 feet in front of the wall. he faces back. a woman is right of the man. she faces back. camera light is gray. ambient light is silver.