Just purchased this unit from a seller on Craig'slist. I am not able to get it to run. The manual says when placed on the track throttle up, wait for bell to sound twice then engine sound. Then throttle back down, then when throttled back up unit should move. The unit is not moving, the sounds are present though. It has a battery, was wondering if it needs replaced or charged. The seller said it was las run last November and worked fine. Any help would be appreciated. Thanks in advance.
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