#32 should be more careful. She could get dirt lodged in her barrel which could result in a dangerous malfunction.

#16 - simple, but not pleasant. Take the child and the mother's hair and wipe up as much of the shit as possible. If needed, remove some of the mother's clothing as needed to wipe up the shit. Eject mother and child from train - don't bother to stop it first. Someone on the train must have a bottle of hand sanitizer , cologne, or perfume. Use it to neutralize the smell as needed.
Enjoy the rest of your train ride as you go through the mother's purse and divide up the contents fairly among those that assisted with the shit clean-up.