battery

Just purchased this unit from a seller on Craig'slist. I am not able to get it to run. The manual says when placed on the track throttle up, wait for bell to sound twice then engine sound. Then throttle back down, then when throttled back up unit should move. The unit is not moving, the sounds...

We just got our new mth railking 2-8-2 Mikado... the dcs isn't here yet. I figured we'd fire it up in conventional mode and play around a little. I'm using a lionel 1033 (oldie but goody). I throw the juice to it and it fires up, smokes and yard sounds start playing but I cant get it to move...