S-motor Pilot trucks

Hi,

I'm working on an S-motor (an S2) and I'd like to convert it from a two-wheel pilot truck to a 4 wheel pilot truck. I am trying to determine the diameter of the wheels, and the wheel base. My understanding is that the pilot wheels were 33" on the "2 wheel" pilot, so i'm assuming it must be smaller for the "4-wheel" pilot.

Thanks for your help!

Chris

With the single "pony axle" was 36 inch,the "pony" truck wheelsets were 33 inch,the 3rd rail shoe beams were mounted on the
pony truck
Check pg 300 in the book "New York Central's Later Power 1910-1968"

You can find a couple of drawings of S-motors from NYC Locomotive Diagram Books on George Elwoods Fallen Flags website. http://www.rr-fallenflags.org/nyc/nyc.html
Happy Hunting!