Tne one and only N&W Class TE1 locomotive "Jawn Henry" would be an interesting, but fairly challenging project. I know of only one set of actual scale drawings that were ever compiled, and those were printed in Model Railroad Craftsman (MRC) back in Oct. 1976, so first you'd need to track down a copy of those drawings. There are some N&W
diagrams , but they're only good getting basic dimensions. They're
not scale drawings.
The RMC drawings are decent, but they lack many details. For example, you'd need to track down photos of the trucks to guess-ta-mate how thick the frames were, and to get an idea of how the truck's pieces (they're shown from side elevation only) fit together. Further complicating things, the drawing show Jawn Henry "as delivered." Within a short time, the N&W revised its coal bunker and redid Jawn Henry's tender (pics below), completely enclosing the tender's special chemical tank that was used to purify the water used in Jawn Henry's boiler, and made other several other changes to the locomotive. The RMC drawings show
none of the details of appendages that sat atop Jawn Henry's roof. The N&W also soon added an auxiliary tender behind Jawn, since he'd developed a terrible habit of running out of water too quickly.
To build a good model, you'd need to buy as many (large) photos as you could find of the locomotive, which you're not going find those online for free.
N&W HS has some and there are probably other sources if you search around. In general, the drawings just don't provide all of or enough details. You'll also need a
schematic that labels Jawn's components, otherwise you'd probably spend some time trying to figure out some of the holes in Jawn's roof actually are for, since few things look like anything found on a "normal" steam locomotive.
And you'd need to figure out what Jawn Henry sounded like. Originally, Jawn Henry was fitted with a standard "hooter" whistle, but with a boiler pressure of 600 psi, the whistle was annoyingly high pitched, so the N&W replaced the whistle with a Nathan M5R24 air horn. And being a steam turbine, Jawn didn't go "choo-choo".
The tender's special water treatment tank was exposed originally "as delivered", but later enclosed (see 2nd pic)...