Re: Sumpter Valley's Heisler #3

I had to end my previous post due to someone waiting for me. Mechanically the Heisler had some cutting edge features. The trucks have what is called a swivel bar. The end of which can be seen between the wheels on each side. It allows for a particularly flexible truck design that maintains wheel contact on extremely rough track. I don't know much about Climax nor Shay design, but imagine this added flexibility would not work on a Climax because the second axle is also gear driven. The gears would likely be more particular about misalignment than side rods and maybe the same would be true for a Shay. Just a guess. The center drive allows for a tighter turning radius than a Shay. By the mid 20's Heisler's had a mech. lubricator to take care of all major lube points on the "motor unit". The fact that Heisler place the bevel gears inside a case that could be filled with oil or light grease was quite an advantage to Heislers working in wet swampy areas. Sadly we lack the covers for our #3. On the other hand, I have no doubt that Shay's have Heisler and Climax beat on ease of lubrication and service to all of the engine and drive train parts due to the outside location.