One of our members, Amir, has been working diligently on using LEDs and Arduino single board computers to enhance the LEGO City display he has in his basement. The street lights are tied to a photo cell and come on automatically when there is low ambient light. It looks amazing.
One of the other fascinating technologies that Amir has used, which is perfect for the Diner, is Light Wire, or more properly called EL Wire, and first was used in the car scene to light up interior dashboards. One can find this on Amazon and other locations by searching for Light Wire or EL Wire. in Amazon, you can find all products. You get a large array of different lights one meter in length.