Bachmann GP40 EMD Noise

[Floorguy24]

I recently picked up two used/older Bachmann GP40 EMD's that are about the same age and both make a "clicking" noise as they run. The noise sounds like a plastic gear constantly catching on something. Is this an intentional noise from the factory? Or is there something wrong? They both run fine, just not used to the noise.

 

[KB02]

It's probably a plastic gear catching or something.

Seriously, that's probably what it is. They're notorious for gears cracking. Pull apart your trucks and you'll probably find a broken gear or two.

 

[Floorguy24]

Thanks. I'll open it up when I have a chance. Didn't want to pull it apart if that noise was "supposed" to be there, like some sound effect. Not an expert with these trains, new to the whole thing.