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It sounds like something is mis-wired. Have you tried operating another locomotive on your track? This will isolate wether it is the loco or the wiring. Does the loco "buzz" as soon as the power is turned on at the power pack, or when you advance the controller? You may have accidentally wired the AC output to the rails. Also, I believe the MRC tech 4 model 220 has a momentum control. This brings the voltage up slowly to get a train started realistically. Try turning the momentum switch off, this should negate that function and apply voltage directly as you advance the control.
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