Kevin,
this is the first time in 18 years of running trains at the CRRM/DGRS railway that I have heard of any kind of buildup of oil from live steam operations onto any track power areas. I had us switch about 6 years ago from Scotch Brite pads to the fiberglass dry wall sander sheets after our trees started dropping huge amounts of sap due to drought stress. The trees branches hang right over the area that you described. Also we have noticed that the duration of sap drop has extended from a month or so to almost 3-4 months. As far as the oil issue the only possible cause could be me running my “oily” Accucraft C-25 too often. I’ll check the sparky track after my next run.
As for how the railhead looks after a good cleaning with the drywall sheets I think that it matches pretty close to the surface after pad cleaning. And it does not cause gouging on the rail head.
Our LGB track cleaning locomotives get plenty of use, and were in use the past Saturday. I suggest that if you notice that the abrasive wheels are worn to the point that you state please feel free to install one of the new replacement sets located in the “track” drawer.
hope we see you out there more often, Alan (CRRM/DGRS Garden Railway Chairman)