Auxiliary Trolley for Light Rail 3.5 or 4.0. This is the same as packaged with the Add a Lamp Hardware. In addition to using it to move a second light, it can also be used to aid in the festooning of vent tubing and lamp cords. The Light Rail Auxiliary Trolley is packed loose.

Light Rail 3.5 is rated to 75 lbs
Light Rail 5.0 is rated to 100 lbs