The drive shaft is inserted into the back of the gearbox via another eyelet. I used another eyelet for the tail-light. This time I just filled the hole in it with clear glue and when that dried I painted the back of the glue red. Gives a nice lens effect. The crank handle is a piece of brass rod bent to shape with a small piece of brass tube forming the handle glued over the shaft.
Hand brake is two pieces of brass rod, one bent at a slight angle to simulate the release lever.
I tried soldering them together but met with less than total success so finished up just supergluing them together. The steering wheel is a brakewheel and staff from a G-scale Bachmann gondola. I made my side with two upright stakes instead of three. It's still prototypical, just different. I also glued the corners of the sides together to add a little rigidity to a fairly brittle structure.