First yes is was the 2-4-4-2 for Tennessee, it could not make the curves, so it was sent back and shipped to Washington. It is rare in it is the first articulated logging locomotive ever built, it is important in that case alone, hardly heard of, yes, given it has some pretty strong competition on the west cost from Mc Cloud River Railroad number 25, SP 4449, and SP&S 700 all passenger locomotives, and currently they are all in the same state. Being in pieces for more than 60 years did not help, hard to gain a name if it is not running, and a rare wheel arrangement to start with.
Many engines are never heard of for good reason. Ever heard of a LNWR DX good class 0-6-0, the most numerically produced UK locomotive in history? (943 were built) Never, hardly a photo survives today.
I never had heard of a Pennsylvania Railroad A5 or H10, before looking into O-guage, yet they seem to be big hits, the basic train set from MTH tend to have an Hx Pennsy 2-8-0 of some type as the base, and the A5 seems to have bee a hit since K-line started making it for them and later Lionel and MTH. The B&O 0-4-0 saddle tank docksider was made by the hundreds or more in HO for decades, yet were rare in the real world, Lionel for years made a 0-6-0 variant. Many other engines have been produced I have never heard of till they are released, yet they seem to sell rather well.
I figure 2-4-4-2 given it has been made in a brass for 2 wheel o-gauge, and as a Korean export in HO in the 1980's, should not be to hard to move over to three rail given the history of part recycling by Lionel and MTH. Its small size compared to Big Boy, or a Y6B should make it much easier to produce in a a rugged rails, detail reduced version, I was not thinking of going high end, just make a low end version or do a poll and see if there was any interest.
I have been kinda shocked "Old Maude" of the B&O has not been made given it was the first articulated engine built in North America, and a bit more widely known.
Who knows maybe this forum topic might make more aware of both "Old Maude" and "Skookum".
Many like me do not have the space for the huge eight foot wide curves, or even the five and a half foot curves of the high end steamers, three feet is pushing it. It would be nice if a smaller articulate was available, 2-6-6-2 or 2-4-4-2, the advantage being the 2-4-4-2 can share several parts with the scale 0-4-0's, if the front drivers are left unpowered, and not look as silly with the boiler overhang, being in the realm of unbelief even for a toy.