The force holding the tractor drive to the rail (the “tractive force”), is provided by an air cylinder. The air tractor drive can be disengaged from the rail remotely so that the load may coast freely if required. A regulator may be fitted before this cylinder to limit the tractive force of the drive (it is usually desirable for the tractor drive to slip when it encounters an obstacle).
The air tractor drive works with most brands of enclosed track including KBK/KLH/ALU. The air tractor drives can also accommodate curved sections in most enclosed track.