FWIW, I have a few of the 3-rail Bowser Brill models, and they have run like clockwork for decades without any service but a bit of oil. Many, many happy miles. Operationally, one of the best features of the Bowser model is the excellent slow-speed characteristics. They can really creep along if you want them to.
The metal construction is very nice, and the heft of them results in a satisfying wheel clack sound across the rail joiners. These were originally manufactured by the Pittman company as a kit, and then later made by Bowser with many colorful paint schemes, so you can search for both.
In a parallel universe I construct finescale 2-rail models, and the Bowser model holds up dimensionally to them,. In fact, in the 70's and 80's there were many articles published in Trolley Talk magazine on converting the models to 2-rail (or live overhead) and adding prototypical detail such as underbody, interiors and clerestory roofs. The Reading Transit Company and several other lines ran cars which were very similar to the Bowser model.
Here is a picture of the Bowser model next to a scale wooden freight motor, so you can see the favorable size comparison.
