I have a G scale Rail Truck and the gears have split.  I called the Estore for replacements and it appears they don't carry them.  Does anyone know where you can get all the replacement gears for the gear box and the drive shaft?

Forgot to add that this is G scale.

Looking to see where I can get the manual on the 36 Ton 2 Truck Shay.  Searched all over the internet but have come up empty.

Thank you