Surely you mean Tim Gilbert? Or is this someone else?
Whoops! Got my Tim buddies mixed up. Tim Gilbert and I worked on the distribution hypothesis. Tim Muir (who is also a STMFC member) does high detail 3d cad models of steam era freight cars, Pacific Electric streetcars, and PE and SN electric locomotives for use in Train Simulators. I've helped him w/ some car drawings & photos.