Nothing that any other plastic bodied diesel of electric wouldn't have. I have one I upgraded to TMCC, it's a nice running unit. It's not as heavy as my JLC GG-1, but it still pulls it's eight PRR 18" cars without any issue.
Just the weight. My Williams GG1s won't pull as many cars as a single cast one and I run mostly 21" aluminum cars or 20" heavyweights. I just double head them. Twice the GG1, twice the fun.
Double headed Williams Gs on about a 12 car train.
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