As I mentioned earlier I use CRC 2-26 to clean rails, then wiped with a clean cloth. I have been leery of using graphite as it's a lubricant and can be dirty.
So I bought two sticks of 2b graphite for testing. Still unsure about the graphite, I decided to put it on the inside of the rails on curves that are part of a 2% grade. Normally you can see and hear the trains slowing down when entering the curves on the grade. Well, maybe it's my imagination, but the trains did not slow down as much when going up the grade and around the curves. There was a definite improvement.
But, how long will it last? Will I have to reapply every week? Will there be a build up of graphite on the ties?
Still testing...