Primary image used for the takeoffs was the Kinsey photo pf a MAC 4-40 speeder.
For height calculations we assumed a 6 foot man based on the measured height of the two men on the right of the photo. For width calculations we used two measures. The first is standard gauge track width of 4′ 8″.
This is a shot of a slightly shorter Skagit MAC 4-40 from Kinsey’s “Locomotive Portraits>”
This is another MAC 4-40 shot from the Tall Timber Short Lines magazine.
The second is the width of the deck which is known to be 8′ from the article in Tall Timber Short Lines. For length calculations we took the known speeder length of 20′. The known dimensions are in red. The rest were derived from the photos. The hood length relative to the cab in the above photo were used to estimate the hood length.
With the above takeoffs I thought I’d take a shot at building the cab and engine compartment using TinkerCad. This is where I am right now.