The Bobsled (ボブスレー・トロッコ,Bobusurē torokko?, lit. "Bobsleigh Truck") is a gimmick that appears in Sonic Heroes. It is a type of vehicle used to travel certain sections of the stages.
Bobsleds allow extremely quick transportation through stages, although they can only be used at certain points and cannot be used anywhere else. They are found in Seaside Hill and Bullet Station. Before hopping in, it is seen standing on the Dash Panel, as it does not move anywhere until the speed-type of character has started to gain speed behind the vehicle. Also, two timers will appear on the bottom-right corner of the screen; one being green and is set to a certain amount of time and the other being yellow which begins counting from zero once the bobsled has started moving, indicating the time spent on the bobsled section.
During the ride, each character in the team will grant an ability for the bobsled, such as maneuvering, jumping or accelerate to a great speed. Once the the bobsled makes contact with an obstacle, one of these abilities will be lost, eventually leaving the Flight character, allowing the Bobsled to only jump. Taking three hits while on the bobsled will cause it to crash, which counts as a life lost so the player will have to start over the stage again.
Each type allows an ability to the bobsled:
Speed - Makes it accelerate (if it hits anything, usually Speed types fall off first; it will slow down if so).
Power - Allows it to steer (if the character falls off, the player will have great difficulty to maneuver the bobsled).
Flight - Allows it to jump (the last character to fall off; if so, the player will lose a life).
If the player completes a bobsled course the yellow timer will stop and instantly turns red while flashing. In addition, if the player is playing that particular bobsled selection for the first time or has finished it at a faster time in subsequent playthroughs, the words "BEST RECORD!" will flash on the bottom-right corner of the screen for a few seconds; otherwise the player's personal best time of that bobsled section will be displayed on top of the current run time (the game keeps records of each personal best time of each individual bobsled section of each stage per team). The team leader is assigned back to the character that was the team leader before the bobsled ride and if the bobsled course was completed within the time displayed in green, the player is awarded a Power Core to that character while the words "PASSED!" appears in the center of the screen for a few seconds.
The trolley which is the haunted version of the bobsled is found in Mystic Mansion in certain areas. Their controls are identical to that of the bobsled but it mainly moves along a rail, eliminating any need for steering.
Bobsleds are the main gimmick used in Bobsled Race like a racing car in the 2P Play of Sonic Heroes.
The characters never mention what will happen if Power Type character falls off. However, they explain what will happen if Fly Type character falls off which is useless, because Fly Type characters are the last to fall off and die.