The railroad is going strong for four years.how do you keep the internal contacts clean for the selectors. Iam at the point of maitanence. I have also changed 14 feeders this year they where full of airborne varnish. By the way I have moved the selectors right now several dozen times.the flow through them can be minimal afterwards.
You should never have to change a feeder and never heard of airborne varnish. Never cleaned any of mine when I still used them except maybe valumed them.
My train room in the basement has2vents for heAt. Maybe the BS from the vents floated and landed. I run the trains once a week. The rest is critiquing time.i live in Chicago so heats needed. So do your 215\s ever act up I do not want to use electrical cleaner do to the plastic. I have heard that the board inside does this sometimes