Comment by 7e

In my experience, these cars are old and decrepit, and force you to breathe locomotive engine exhaust all the time, and especially when the train is idling. It’s a fast track to cancer. Don’t spend any more time than you need to in one. They do not offer the air quality of a modern passenger rail car. Heck, I wouldn’t even sleep in a modern rail car at night, in a rail yard, when all systems are off.