I remember seeing this gem behind glass, during restoration at the Carson City museum.

If my memory is correct, the internal combustion engine is mounted directly on the front truck.
The engineer hand operated the gasoline engine - very close to his seat.
The car is "single-ended" and must be turned to the the terminals.

Steam engines, which they were replacing in branch line service, had the same requirement.

Since this was the first motorcar on the market, the designers could "get away" with such details. But it gave the competition a real opportunity to fit into the market with a
double-ender.

Do any other McKeens exist?

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Once upon a time, I saw a former interurban car as the highway face of a restaurant.
During lunch there, I inquired about the car's history. The staff were "clueless".
I knew exactly where it had come from: Bamberger. I had ridden it in 1949, but I chose to play dumb.

Wonder if the car is still there? Near Provo, Utah - on the "old" highway.