I-Repair: This is a refurbish service for LightRail 3.0, 3.5, 4.0 Drive Motors that are not working to expected standards. And, the refurbish service includes a new gearbox. It also includes four new trolley wheels, a new drive wheel, a new 1 year warranty on those parts and return shipping. Note: I-Repair Instructions are detailed farther below. US locations, simply Add To Cart. Not in the US? Orders can be placed through sales@LightRail3.com.