You have a long way to go - here are some additional engines
Scale Models - Weaver
Hiawatha (note there is the 4-4-2 version too)
PRR
Lehigh Valley - Black Diamond
Lehigh Valley John Wilkes
...and if you decide to expand into the more toy like realm there's even more...here's a few examples
Lionel
American Flyer
Marx
JEP
etc.