The H.S. Booster Track is a special type of track from the Railcraft mod. This track, along with H.S. Transition Tracks, is used to make minecarts running on H.S. Tracks reach the maximum speed. Additionally, if these tracks are unpowered, it will slow down minecarts to a safe speed instead as if the minecart travels opposite direction on H.S. Transition Track. These tracks require a redstone signal to operate.