The Colt Express: Marshal & Prisoners expansion contains three new components:

• It adds another character "Mei", a martial arts lady.
• The players can free prisoners from the prison wagon that is added to the end of the train.
• One player can play as the marshal, who has two decks of bullet cards and three specific items.
• The Marshal has got four hidden and random objectives, he must achieve it to win the game (i.e. shoot every bullet from one gun, catch a Bandit, Shoot at every Bandit, ...)
• Freeing junior bandits from the prison car gains their help (i.e. a secondary ability for your character)