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This question already has an answer here:

I was working with the main locomotive of set 7898. I put brand new batteries in both the controller and locomotive but for some reason every time I press the button to turn on the train, the red light comes on and I press the button to make the train to go and nothing happens.

Any idea what the issue could be or how I can fix this?

marked as duplicate by Mr. Shiny and New 安宇, David Lechner, Móż, Phil B., pcantin Dec 2 '16 at 23:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Please check the possible duplicate answer. If your answer isn't found there, please edit your question with details to help us troubleshoot it. – Mr. Shiny and New 安宇 Nov 19 '16 at 4:23
  • I believe that the answer you referenced is for PF trains and the issue here is with an RC train. – jncraton Nov 19 '16 at 13:02
  • While the referenced duplicate is for Power Functions, the steps to diagnose the issue are fairly similar - ensure that you have good line of sight between the controller and the receivers on the sides of the engine, check the motors still work in the wheel units with a direct connection to some batteries, etc. The set is about 10 years old, so some wear and tear may be expected. – Zhaph - Ben Duguid Nov 23 '16 at 15:30