The H class Fell engine operated on three rails. It had outside stephensons or Joy valve gear as well as an inside engine driving horizontal wheels that clamped either side of the centre rail. It operated on a three mile section of track with an average gradient of one in fifteen just north of Wellington New Zealand
Im quite impressed to see someone building this Engine
Anybody coming to NZ & interested in railways......most of you!..... it’s worth a visit! The actual railbed is now a cycle trail..... if you are keen! I visited back in 92 or 93, & when we got home was telling my neighbor ..... turned out he had been a guard on the railway & lived at Crosscreek! We went again 2 years ago & the museum has come on a lot! There is now a Model Engineer track pretty close by.
I've just watched the first 5 videos. He doesn't seem to hold back on his cutting depths!
Is the way he did the axleboxes prototypical to that type of loco? He's slotted the horns and put a central tongue on the sides of the axleboxes so it doesn't look like there is any clearance for the axleboxes to rotate when the wheels move up or down on one side.
It seems to have outside Stephson's valve gear, that will look cool. And it looks very complicated where those centre rail grippers are. It should be a great build to watch.
I'm in awe of his F360 drawing skills. I can make 3D models but am yet to create a usable drawing from the models. I have to use derived dimensions on the sketches and the inspect function and make my own scrap drawings with paper and pencil.