PONZ,
I own a Scale JLC TMCC/Odyssey Tuscan Green GG1. It pulls 20 Plus big Tin Plate Cars, and does not break a sweat. Remember however if you purchase these scale GG1's they all run on 072 and bigger curves. You got to have the layout space to run one! I love mine!
It you can get you hands on an Original Scale Williams GG1 they are stump pullers also!
PCRR/Dave