Mostly ASA 64 Ektachrome... but it is very deceiving since almost everything I post has been gamma and contrast corrected and color balanced to some degree. The result is that you are complementing my eye more than you are the film I used.
The center axle on the A1A was not powered. It served to provide the pulling power of a B truck but with the weight spread out over 3 axles. Sounds kind of silly today but in the 30's and 40's when the concept originated there was a lot of light weight stick rail out there.