Twice I’ve seen these coloured patches on the rails, and I’m not sure what their purpose is…
The first shot is at the east end of a siding, taken from the north, and the second one is the west end of a siding 40 miles west, taken from the south. And ideas why they’re there? As a reference, the SE rail is always green. Also, this stretch had some new ballast put on the sides a couple months ago, and I assume the rails were painted that way a the time. (I also assume that the wiring was sub-ballast before)

