There are some small companies like Imperial Hobby Productions, Island Modelworks, etc that will produce resin castings of trolley, subway, LRV shells, but the details on them are all cast on, and they charge an arm and a leg for them, often not including the drive mechanism.
IHC and AHM imported the Boeing Standard Light Rail Vehicle (SLRV) decorated for the Boston MBTA and San Francisco MUNI (the only two agencies to ever own them). They were made by Mehano. Details aren't too bad, and they run ok, but they are a bit slow due to the low speed Mehano motor, and only one of the three trucks are powered. (prototype had two trucks powered). CustomTraxx makes a new floor for them which also has two motors, but costs more than $100 so I'm going to splice together two half sections of the LRVs to have two powered trucks. I have one for MBTA, and one for MUNI.
They have pizza cutter flanges, but will operate without problems on Code 100 (I haven't tried it on Code 83 yet, but it shouldn't have a problem as most Mehano-made locomotives can run on Code 83 without bouncing on the spike heads) Older production models have brass wheels while newer production models have Nickel-Silver.