The Legacy Pacifics are not good performers unless someone likes jerky starts, lurches and ultra fast loops around the layout. I have three, they are all about the same. Changing the control system will not make a difference. The cause is a poor selection of the drive gear ratios. My six older TMCC version of this engine operated similarly. Those engines had the worm gear replaced with a half speed worm sourced from American Models. it completely transformed the engine operation. I doubt that it would be easily possible to swap the worm gear on the Legacy version.
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