How does the sound work in the North Star Express? It's an older model(8-10yrs). From the Big Haulers series
See if this helps --
Click Here (http://www.bachmanntrains.com/home-usa/dwg/L.S_L.S.Instructions.pdf)
Refer to SPEED-SYNCHRONIZED SOUND SYSTEM OPERATION - page 12
Worked like a charm. Once I located and changed the battery.
Made me a hero with grandkids.
Thanks a million!!
more . . .
Click Here (http://youtu.be/mxTWNdIusF4) to view video with information about lubricating the model. The design of your locomotive made be slightly different.