Scott,
Remember the engine and tender rollers do not connect. The engine rollers are for the engine only and the tender rollers work your Railsounds. Bill and John I feel gave you your probable answers. To check for the antenna issue, set your meter to continuity and put one probe on the handrail and the other on locomotive ground. If you see continuity locate and repair your issue.
I see many engines that end up like that after someone took the boiler shell off. Many have handrails that extend down to the pilot deck and upon reassembly the handrails never get replaced into the insulated bushing on the pilot.
