Steam-Powered Mummy Sled
From the Super Mario Wiki
The Steam-Powered Mummy Sled is a special sled that Luigi constructed out of a destroyed steam machine that was once a part of his Steam Cloud Balloon. It appeared in The Adventures of Super Mario Bros. 3 episode "Mind Your Mummy Mommy, Mario".
Needing a way to escape from a tower in Castle Koopa with Prince Mushroomkhamen's stolen mummy case with Princess Toadstool and Toad, Luigi thought to himself "What would Mario do if he were here?". This gave Luigi the idea to build a sled out of the destroyed steam machine that could transport the mummy case. Being an expert plumber, Luigi managed to construct the Steam-Powered Mummy Sled in mere seconds.
At the same time, Bowser had ordered Princess Toadstool to come down from the tower at the bottom of the stairs. However, he and his Paragoomba guards were shocked to see the mummy sled charging down the stairs. Some of the Paragoombas tried attacking Luigi, Princess Toadstool and Toad, but Raccoon Luigi managed to take care of some of them with his tail, while the sled plowed through several more.
After speeding past several Chain Chomps, the sled went flying out of the castle, and landed in the moat around Castle Koopa. Despite being built out of pipes and having to support the weight of four riders plus a golden mummy case, the mummy sled could somehow float, and was able to function as a motorboat.
The Steam-Powered Mummy Sled was never seen again, as Luigi, Princess Toadstool and Toad had apparently ditched it for reasons unknown by the time they returned Prince Mushroomkhamen's case to Queen Mushroomkhamen.