Good evening Ed, I have had trouble with my two MTH PS3 Pennsy M1a with the drawbar on the tender end coming disconnected.
My layout has developed a couple of slight dips which has made my track slightly uneven.
When these two engines would travel thru these slight dips the engines would either stop or hesitate and then take off.
To solve the problem I ran a black zip tie around the drawbar and the upper pin assembly that goes down thru the drawbar.
After this addition I have not had any more issues.
My MTH PS3 Pennsy K4 has a black plastic piece that slides up over the square hitch pin tightly which holds the drawbar up in place.
So far this engine has not given me any issues traveling thru the same slight dips in the track as my M1a's.
I hope this is all that's wrong with your J.
