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Power Functions Train Issue

We set up my son's Winter Village sets yesterday along with the train which we installed the Power Functions motor into. It worked fine yesterday (as it has in previous years) but this morning we had a malfunction. When you turn on the battery pack the train runs at full speed regardless of what the remote is doing. It won't slow down, stop or otherwise respond at all. The remote is still working, the lights light up when you press the buttons and I tried changing the batteries in case they were running low but no effect. Does anyone have any ideas what might be wrong and how to fix it?


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