Cylindrical objects - what are they?
 

Does anyone know what are those cylindrical objects you see from time to time alongside rail tracks. I can best describe them (sorry don't have a photo) as a flanged cylinder about a foot diameter and a foot long, mounted at a 45 degree angle from the vertical. Usually painted yellow, though not always. You get them on electrified and non-electrified tracks.

I'm guessing they're something to do with track-circuiting but could be wrong.

I know what you mean. I think they are access ducts to do with what you have suggested. I'm not altogether sure and would like to know the real answer myself.

Would they be the Grease Pots for rail flange lubricators, usually located before curves in track alignment?

If you can get a long enough look there will be four or so of approx half inch diameter pipes leading to the side of the rail.

Thats right they are Grease Pots for rail flange lubricators

All the best,Ian