This is a recent purchase. I noticed this sound which others have described as a playing card on the spokes of a bicycle. You can hear it above the normal engine sounds.
In the video, I turned off the sound to try to figure out this out. It seems to be coming from the engine before the cab.
I took it to local hobby shop and was not fixed as what they noted as not unusual for mechanical noise. They ran power to the engine but when they tested it was not on a track with just power applied. So this makes me think it is perhaps a roller or only when there is weight of the engine when on the track.
Couple of questions.
1.) Is this not normal?
2) Have you experienced this before on any of your engines.
Thank you in advance.