PS-3 RS-11 acting up

Kind of sounds to me like it not picking up the power very well. Maybe  it's the wheels or rollers or both. The flickering is not code but probably  a electrical pick up problem... proto-2 engine carry on with the last command given even if the dcs signal is completely lost.

Do you have a continuity meter??

Gregg~ I do have a meter. The front headlight blinks on when i'm going backwards.

I would make sure the track in the section is clean and that the engine wheels and pickups are clean.  Does this engine have the 2R/3R switch?   G

A lot of features with this one(I want one) other than checking out continuity between rollers at the work bench the manual may help... I would at least slide the the switches back and forth a few times.

http://mthtrains.com/sites/def...ction/20dl17153i.pdf

Good morning~I'm going to check track and wiring first. I suspect bad ground on this locomotive, It does have a 2-3 rail switch. The trucks on this are different than other MTH 2-3 rail, both trucks have the gears on the same side of locomotive. The insulated axles are on the same side. The section of track is the farthest from power and at a end of block.   

Good morning~I'm going to check track and wiring first. I suspect bad ground on this locomotive, It does have a 2-3 rail switch. The trucks on this are different than other MTH 2-3 rail, both trucks have the gears on the same side of locomotive. The insulated axles are on the same side. The section of track is the farthest from power and at a end of block.   

Feeders to both outside rails  & run the  the crap out of the engine.. break it in...