Yeah, not many American 0-*insertnumberhere*-0 are around, all we have are the UP 0-6-0 that comes with Trainz 12, AltoDave's AT&SF 0-6-0 and cincysouthernrwy's many reskins, leeferr's 0-6-0, the PRR A5 94, PaulzTrainz's 0-6-0s (One in my opinion looks like a poor reskin of the NYC 0-6-0 that Bill made, SteamMachine's 0-4-0T, the Generic 0-4-0, which I used the drivers for my unfinished reskin of lilb's Reading 0-6-0 into Reading 1187, Tigerko15 has a model of CNJ 113 on his new website
One engine i'd love to see made for Trainz is an american USATC 0-6-0T