The Budd car is now equipped with a pair of red marker lights on each end. In fact, it is optical fibers from a cheap Christmas ornament that carry the light from red LEDs installed in the car roof bulge. A very simplistic but efficient use of diodes makes the light reversible, which is a great feature for this car.
We were afraid the very small optical fibers would be too small to be realistic, but the results far exceeded our intitial expectations. It would be quite great to add this feature to caboose too.
Next step will be to add new couplers and probably some kind of screen to minimize light in the cab. Some faint lighting could also be installed in the passenger compartment to bring some life to the model... and add passengers too.