I have previously commented favorably on the use of ATF as a method of improving electrical conductivity.
My observation is based on its use on HO layouts using DCC. Prior to ATF application there were often issues associated with dirty track - jerky movements, stalling, and failure of DCC signaling. Application was by dampening - not wetting - a cotton swab and wiping both rails over a length of a foot or so. A couple of laps and the trains operated flawlessly. This application is done maybe twice a year on layouts that see regular use.
I started using it on my three rail layouts. On O gauge, after a year or so of applying ATF to all three rails, I did experience some traction tire failures - mainly stretching and subsequently being thrown off. On my standard gauge trains there are no traction tires, but I did have some serious traction issues on heavy trains - five big passenger cars, or four/five heavy AF freight cars. No other problems have been encountered.
I continue the use of ATF, but apply it only to the center rail. It has virtually eliminated flickering in seldom-run rolling stock and in pre- and post-war items. Even new passenger cars have had flickering problems resolved by using ATF. The rollers are cleaner, and the center rail is easier to wipe clean.
I remain convinced that it can be safely and effectively used on the center rail for the purposes mentioned above - the improvement of signal flow where applicable and general electrical conductivity.
