From the Super Mario Wiki, the Mario encyclopedia
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The player starts off on a platform, with a Switchboard next to it. The Switchboard goes along some rails that lead to a water geyser that propels the Switchboard onto another piece of track that leads to another Switchboard. If the player goes past the water geyser, they land on another part of track that leads to a 1-Up Mushroom and a Warp Box that warps to another Switchboard.
The next Switchboard leads past several Paragoombas and Rocket Engines before reaching some Spikes with a ? Block that contains a Poison Mushroom in it. Next to this is another Switchboard that goes past a geyser that propels it onto the next bit of track that leads past several more Rocket Engines. The Switchboard then drops onto another piece of track that leads past several Brick Blocks, one of the Blocks in the final set is a Fake Block, and then leads past some Bullet Bills and Tail Bullet Bills before leading to a geyser that propels the Switchboard into the Goal Pole.