@EscapeRocks posted:Chuck, do the Flyer's use the handrails as antennas like the O gauge Steam. What you described sound a bit like one of the handrails may be grounding itself to the loco. Maybe check that all spacers/grommets are in place?
Just a thought since you say it does run fine on DCC
I am not sure. I have two other AF Legacy steamers, but I have never taken the boiler shell off to see. I do suspect it is an antenna issue though. I may get antsy and remove the shell to see if it is anything obvious, but the warranty can be pretty easily voided if you mess with them too much.