And Iff'n you wanna build one, I got all the UP plans on mikerflim.
They used an evaporative carburetor (which must have stunk like the devil).
The Motorman's seat was a backless round steel stool. The throttles were overhead, much like the later ALCo throttles in the steam engines. The engine blocks were fabricated. The inside must have been something to see, though, as there was a curved bench along the back where you see the rear windows.
The Ann Arbor cars had a parabolic nose, as did almost all cars built for railroads other than UP. The UP McKeens had a sharp knifelike nose. There are still UP VanDyke copies that exist of the original McKeen drawings.
Willie McKeen also designed a car which he submitted to Harriman for a standard coach. It was a derivative of his car and design, with a center, lowered entrance door and diaphragms on both ends. He was ahead of the standard commuter equipment by about 50 years.
McKeen also designed UP's first Steel Box Cars to be built in quantity. The last remaining example is in Union, IL at the IRRM. This came from Buford where it was on the ground for many, many years. Surprisingly enough, the car was the first car built in the series and the "Class Car" for this particular box car. It has a unique "X" ribbing on the outside of the door.
Rick