General maintenance including cleaning and lubricating our trains is necessary for good performance and longevity of our equipment. A drop of light oil like Labelle 107 on the axles where they go into the bearings is needed. Do this to the locomotives especially, and also to all your rolling stock.
The motor needs a little lubrication also with a drop of oil at each end of the armature. The gears need a little grease on them also.
Larry