A THRUSTLINE alignment is a specific alignment procedure where the front wheel TOE angle is set relative to the rear wheels.   Specifically, the THRUST ANGLE is measured at the rear wheels, then the front wheel toe angle is set to compensate for any variation of the thrust angle value from (usually) zero degrees.

Other alignment types are 4-WHEEL Alignment and CENTERLINE Alignment.
More detailed informations about THRUST ANGLE and other wheel alignment angles will be available soon.