In Albuquerque, NM, there is a group rebuilding an ATSF 4-8-4 #2926. They will finish in 2-3 years. It would be great to have a Spectrum HO model of this engine. Here is the link to their website: http://www.nmslrhs.org/index.php
Bachmann already sells that class if engine in HO
From what I've seen, Bachmann Sells the 3776 class 4-8-4, thinking 3783 and 3784 (the one i own) are the 2 road numbers available currently. The famous 3751 is the same wheel base but belongs to a different breed of loco (stat wise).
jtf-
You're right. The existing Bachmann Santa Fe Northerns are models of the road's greyhounds. (Actually, they aren't all the same class.) The 2900 Class were huge brutes -- massively powerful and very fast. Indeed, an accurate 2900 Class would have trouble negotiating the curves on most model pikes, which is why I don't expect to see a plastic one. I'm grateful for my brassie.
-- D