No idea what you mean by compatible with brass rail. You can probably tie them together and run over the joint.Looking at the trains that are battery operated like Polar Express and Hogwarts. They come with plastic tracks. Are these compatible with brass rail? Do the cars interchange with G scale model railroading or is the scale the only similarity?
https://www.bigmacktrucks.com/topic/33657-mack-rail-–-the-locomotives/Mack Trucks produced its first locomotive in May, 1921. It was a 33-ton chain-drive four wheel steeple cab locomotive powered by two 40-horsepower AC gasoline engines mounted fore and aft of the cab.
Mack “No.1” was designed by company engineers as a working prototype switchyard locomotive. It underwent long-term evaluation shunting freight cars around Plant 5’s sidings and the company’s shipping and storage center located the Allentown-Reading main line. A specially designed and centrally mounted transmission allowed for single or dual engine operation.
Valuable experience gained from Mack “No.1” ultimately resulted in the production model BR.
I agree with John that the Hartland Mack is the way to go. I tweaked mine just a little and it has served faithfully for more than 15 years.