The overhead rail system fixed to the car door header on which car door hanger rollers slide to guide door panel movement during opening and closing.
Full Definition
The car door track is a precision-formed steel or aluminium profile mounted horizontally across the top of the car door opening. It provides the running surface for the hanger rollers attached to each door panel, guiding the panels through the correct path during operation. Track straightness, levelness, and surface condition directly affect door smoothness and noise. Dirt, wear, and roller flat-spotting are common causes of rough door operation. The track must be kept clean and lubricated in accordance with the manufacturer's maintenance schedule. Replacement is required when rail wear grooves become deep enough to allow roller bounce. Correct track inclination ensures doors close by gravity in the event of motor failure.
