Sorry for the late reply. The Shay is easier. From memory, you'll pull the trucks off with one screw on each holding it to the chassis. Then, the motor is inside that round bit in the center of the chassis and you can access the gears once you open that part up... I think the engine slides out with the gears on top, but don't recall.
The porter, I think, just has a plate on the bottom and the gears are inside that.
Here's a tutorial on the shay. https://www.youtube.com/watch?v=f8umshcB1Ak&t=276s
The porter, I think, just has a plate on the bottom and the gears are inside that.
Here's a tutorial on the shay. https://www.youtube.com/watch?v=f8umshcB1Ak&t=276s
