Ken,
What Railsounds effect did you use from ERR?
I have the Lionel conventional 2 truck shay, "Bunyan Lumber", 6-11298. I have been hesitate to upgrade it to Cruise Commander and ERR sound.
The factory sound is synced to the 3 cylinders, and has a deep whistle. When I compare the model's sound to a 2 truck shay that operates on a tourist line near by, the 3 beat chuffing and deep whistle appear to me to be dead on. I would hate to loose both of these sound effects on my model.
I have no suggestions on the battery, but then, for me, I rarely install batteries in my TMCC/Legacy engines. I know other always use batteries, it's just my thing.
Ray