There is very little spare room under many trains, and chances are something will grab you and bundle you up into a disorganised mess of broken limbs. You probably won't die straight away, it'll take a while. Stay off the tracks. Trains are faster, quieter and more deadly than you think.
Do Amtrak sleepers have private bathrooms?
Unlike roomettes, our bedrooms also have an in-room toilet, shower and a sofa that converts to a bed.