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it might be on your end idk but i can do 5 mph and not derail its a 50/50 but overall it works and i love it haha 

track need to be lined up almost perfect i found snap off works best for me but if you have animaded objects it will make trains derail because switches change as you go threw 

thank you! And as for the derailments, I have been able to take 10 degree turns on mainline at 25mph with a 50 car intermodal train. The track does have to be pretty perfect, are you unfolding all locomotives and rolling stock? If not, they will derail at any turns