From the Super Mario Wiki
A trolley goes down a railroad track from the right, and a train station with some passengers is seen on the left. The player must hit the button at the right time to activate the brakes so that the train will stop at the station. Braking does not stop the train instantly, it gradually slows it to a stop.
The player will fail the microgame if the trolley hits the rocks, if it is not close enough to the train station to pick up the passengers or if it fails to come to a complete stop (which can happen when the game is played at a high speed).
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