My Wife has a Bachmann Big Haulers Rocky Mountain Express that has not been set up for quite a few years. We took it out for Christmas and I put it around the tree, but when I tried it out the sound was not working. The engine is a 4-6-0 with 25 on the cab, and the tender has Rio Grande Southern on it, I made sure the cable between the 2 was plugged in, and that the switch was on and I put in a new battery. Still no sound, can anyone give me any thing else to try?