L-R: Mike Kistner (John Truit) and Katie Ward (Esther Smith) of the Stissing Theatre Guild.
"512" is a modified golf cart. TWA at JFK Airport modified two golf carts to look like cable cars to publicize new San Francisco flights. After a number of years shuttling people around the airport, the carts were put into storage. Paul Barker, an employee of TWA and museum volunteer, noticed the cars in storage and inquired if he could acquire one.
After the cart's arrival in Kingston, it received further modifications to look like a trolley car: a pole and fender were added. The cart also received a fresh coat of paint and the lettering you see in the picture above.