track,

・

A rough path or road, typically one beaten by use rather than constructed.
A mark or line of marks left by a person, animal, or vehicle in passing.
A continuous line of rails on a railway.
A recording of one song or piece of music.
A continuous articulated metal band around the wheels of a heavy vehicle such as a tank, intended to facilitate movement over rough or soft ground.
The transverse distance between a vehicle's wheels.
A group in which schoolchildren of the same age and ability are taught.

Follow the trail or movements of (someone or something), typically in order to find them or note their course.
(of wheels) run so that the back ones are exactly in the track of the front ones.
(of a tunable circuit or component) vary in frequency in the same way as another circuit or component, so that the frequency difference between them remains constant.
Tow (a canoe) along a waterway from the bank.