I recently found an original 1935 Flying Yankee which needed a motor. Luckily, I found one relatively quickly and on the weekend I went to try it out. It powers on, but will not move. I'm assuming it's the e-unit. I'm new to prewar so although I'm sure it's relatively simple, I don't know anything about it. Any advice on what I could try / do before having to send it to a Lionel repairman? Thanks in advance. I can take pictures or add a video if that's helpful.