I was stuck in a train heading for Miami Florida for 24 hours. The constant rattle of wheels on rails and sudden train movement made sleep impossible for me. To make matters worse, passengers in adjacent cubicles were smoking cigarettes like chimneys and it was all wafting into mine via the ventilation system.
I spent the entire 24 hour trip coughing since I am allergic to cigarette smoke, Ironically, I had assumed that the private cubicle that I was paying extra for, would protect me from smokers in the regular train passenger areas.