So, I got the Pennsy M1 reset to factory default, and got the handrails glued back on. It seems to be running just fine. The speed control works as it should, the sounds are excellent and I haven't had a bit of trouble from the drawbar. However, as I was running it last night I heard a very quiet clicking sound coming from the locomotive as it would pass by. I got down close to the track a slowed the locomotive down. The clicking is very rhythmic, and sounds mechanical in nature. The faster the locomotive goes the faster the clicking. It is hardly noticeable with the sounds on, however with the sounds turned off you can definitely hear it. It's not loud by any means, but I'm just not sure what it could be. I have oiled all of the running gear, and it's not the fan for the smoke unit, as that is an entirely different sound. If I had to guess where the sound is coming from, it appears to be toward the middle or back half of the locomotive. Any ideas? Perhaps it's perfectly normal and I should just run it until something stops working 
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