@Vernon Barry posted:A little searching, I found that info on that modification. Only applies to a specific Railsounds 1.0 that I mentioned earlier
https://www.lionelsupport.com/...am-RailSounds-Boxcar
6-19886
That said, I think your car 6-16649 is maybe also an early Railsounds 1.0 and thus the same info may apply?
The 6-19886 car you reference is a RailSounds 3.0 model from 1997, here's the parts list from that page.