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Knex Roller Coaster Booster

Hey guys, I made a roller coaster booster.

Instructions are here.
http://knexinnovation.gigacities.net/forum/viewtopic.php?t=214&highlight=

Picture of Knex Roller Coaster Booster
DSC01043.JPG
what kind of track does it go with
Basically,if your coaster train is nearing the end of the ride,these things would pull it into the station aka tire drive.
TigerNod8 years ago
What does it do?