Lol on the Ms Manner post. Realistically the notable list of train travel etiquette would be:
Let an elder, adult with child and those carrying stuff go first at connecting doors.
Try not to slam bathroom doors or leave open after use (considerate to those seated nearest to potties).
Pickup your area before exiting train (don't be trashy).
Give a helping hand when someone is struggling to carry or lift something.
Move if your single and splitting up a family ( meant in a nice way).
Turn down your cell phone ringer and use your inside voice during conversation. I really don't want to hear about your prostate 10 rows back.