A tracking shot is any shot where the camera follows backward, forward or moves alongside the subject being recorded. In cinematography, the term refers to a shot in which the camera is mounted on a camera dolly that is then placed on rails – like a railroad track. As a result, this type of shot is often referred to as a dolly shot. A handheld steadycam or gimbal may also be used for smaller scale productions. The camera is then pushed along the track while the scene is being filmed or moved manually when using a handheld rig. The technique is often used to follow a subject that would otherwise leave the frame (ergo, it is often called a following shot), such as an actor or vehicle in motion. A handheld or Steadicam mounted camera following a similar trajectory is called a tracking shot as well. In fact a tracking shot can use any manual or motorized conveyance, and may include careful planning for passing the camera between vehicles or modes. While the core idea is that the camera moves parallel to its subject, a tracking shot may move in a circular or semi-circular fashion, rotating around its subject while remaining equidistant. This kind of shot, in which the camera itself moves along with the subject or in relationship to it, is often confused with panning, in which the camera remains stationary but pivots right or left on its axis. Variant A variant of the tracking shot is the onride video, also known as a phantom ride, where the camera films during a ride on a train, an amusement ride (especially a roller coaster) or another vehicle. Such videos may be used to document the route, and the camera can be fixed to the vehicle or held by a person in the vehicle. Use in sporting events The "rail cam" made a public debut in the NHL on November 20, 2006 in the Colorado Avalanche/Dallas Stars hockey game. The Versus cable television network used the camera during the game to test it out for a live use on a nationally broadcast program. The camera was fastened to a rail system that ran on the top of the glass on one side of the ice rink. As the play shifted from end to end, the motorized mount allowed the camera to follow the action, sliding rapidly down the side of the