Hi, Need some help. I have a 1980’s Lima Class 55 with a ringfield motor. That does not run very well on track. So far, I have tried the loco on the track and it seems to run extremely hesitantly. I have tried it in different directions etc. still no change. The only time it slightly improves, is if I press down on the top of the loco. As it has been packed away for almost 25 years. I took the top off the loco and checked the motor with a 9v battery directly on the motor inputs. With a battery connected the motor seems to run fine. In both directions Any advice as to what to do next would be appreciated. This is one of my original loco’s from my childhood models. Approx 1980 ish. So holds alot of sentimental value Having never opened up a loco before I am not sure where I need to start looking to improve the running ability. Regards, Kevin