Devon Sinsley said:.
John,
I will admit ignorance when it comes to geared locos. I thought shay was a type not a manufacturer. I thought it was like mogal, or mallat ect.
Devon, well it’s kind of both. Its the manufacturer, but also the type. The Shays were built by Lima, and they had 2 or more usually 3 cylinders on the engineer’s side of the locomotive, with a driveshaft running outside of the trucks on that side.
The Climax was built by Climax manufacturing, and it had Cyliners on the sides of the locomotive, angled downward that drive a jackshaft, that drives a gerabox. The gearbox in many of them had a 2 speed transmission. The gearbox drives a centerline driveshaft.
The Heisler has the cylinders aranged in a V, driving a centerline driveshaft. The driveshaft only powers one axle per truck, so the Heisler has side rods to transfer power from the driveshaft driven wheel to the other wheel in the truck.
There are other, less common, types of geared locomotives too. Types like the Dunkirk, Williamette, and others.