Or how about this... A list of (some) of the MTH only models. There's a bunch I'm missing but off the top of my head:
M1 Turbine
AC-6 Cab Forward
PRR Electrics (previously mentioned)
PRR Q2
GN S2 4-8-4
C&O Greenbrier
CNW E4
Santa Fe Hudsons (2900 class, 3460 class)
NYC Mohawks (minus L3a and L2a)
ANY Subway MTH made
DDA40X
U25B
U30C
U50C
UP Turbines (coal, propane, big blow, veranda)