There are three standard types of tracks used worldwide. They are often termed "H", "J", and "L" track, after the names of the manufacturers that established the standards, Halo, Juno, and Lightolier.
To identify a track fixture, if it has three contacts, it is likely an "H" type. If the contact-tips are 1 inch apart, it is likely a "J" type, but if they are 7/8 inch apart, the track is likely an "L" type.