I've been going through Worleys book Iron Horses of the Santa Fe Trail, and steamloc database. I will look through other books if I can . . .
In general, the only x-6-x steamers I have found so far that the LC+ Hudson "fits" as scale are either early Prairies - and there were tons of slightly different ones, all fairly undistinguished, and several tank engines. I'm looking into a the "CentraL RR or New Jersey's" H-1 class of 2-6-4 tank engine (1923) that is called "surprisingly modern and well-proportioned . . . " in the steamlocomotive database. I don't have a photo and I am not sure I want another tank engine, but . . . so far it appears to be the best candidate unless I want to do another ATSF Prairie, which, maybe . . .