I am setting up my layout and am running a Spectrum 2-8-0. What I am wondering is, if I am straining the locomotive motor by running up to 18 mixed freight cars! At an average weight of at least 3.5 oz/car x 18 = almost 4 lbs. dead weight to drag. The loco seems to run just fine even up a short 2% grade, but I don't want to burn out the motor! Comments? Thanks Eric.