I've counted the gear ratios on a lot of locos, and at one point several years ago, Dave Hikel shared a table with some common gear ratios. Every MTH diesel I've ever measured is geared at 10.5:1. I thought I measured the wheels at 0.875"; that loco may have had a lot of mileage with its tires worn smooth.

Understanding the Context

I no longer have physical access to all of the locos I measured. In trying to relate the ...