Abstract: There is provided a method for assembling a rail vehicle. The method includes positioning a plurality of motor combos on a fixture frame. The fixture frame may be adapted to hold each of the plurality of motor combos positioned for an assembly into a rail vehicle truck. The method further includes positioning a plurality of springs on each of the plurality of motor combos. The plurality of springs are positioned for the assembly into the rail vehicle truck. Additionally, the method includes simultaneously lifting a plurality of motors such that a truck frame may be coupled to the motors. The plurality of motors corresponds to the plurality of motor combos. The method also includes connecting the truck frame to the plurality of motors, attaching a spring compression fixture to the truck frame and the fixture frame, and compressing the plurality of springs for assembly into the rail vehicle truck.