The ancient Mach-1 Skytrains in Vancouver. The front and back of each car have a small door, and when looking at that in combination of the shape of the train around that door, it looks just like an outhouse. Not only that, it has been known in the past and still occurs occasionally, to function as one, where people will use the space of where the fold down seats are just behind the small door, to take a poo poo!

These old poop poo trains are also known as boobie trains, crying trains, chicken slaughter trains.
1. Oh no, I just got poop-sandwiched by the poop poo train, had I been a little earlier or later to arrive at the station I would have boarded a Mach2 or Mach3 train!

2. If you see a pair of jeans, clothing, or bag left behind at the "outhouse area" of the poop poo train, do not touch it! It is likely to be covering up someone's turd!

3. Guess the people who designed the train wasn't paying attention to prevent it from becoming a poop poo train!!!
by nimbys_suck October 16, 2018
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A toy train where human fieces are the engine and cars, twigs are used to connect them, and rocks are the wheels.
Jim Bob was so poor when he was a kid his parents could not even afford to buy him a poop poo train. But look at him now, he has a whole collection.
by ricflairismyfather October 7, 2005
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Exists to serve the LCOE and Big Mac, Dave Messinger, and Dr Hardy. Lead with a light touch
“”We plan on doing lean strikes in Alabama, it’s important that we hit take a ride on the Alabama Poop Train into steady state...”
by Matt Arnold — 5 April 20, 2018
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The trading of helping your poop on to make you butt grow.
I've poop training all day, so my but will grow
by Hhhhhoknhgbbkbg May 5, 2015
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