Nowadays, not all railroads even use sand. The steel plant where I worked switched to another material - I don't know what it's called, but I first noticed some laying on the ties, where it had leaked from a loco. When I asked the Yardmaster (various Yardmasters throughout the plant controlled the assignment of locos to the various jobs and departments) about it, he said they had switched recently from sand. What had really piqued my curiosity, though, was that its size, colour, and texture looked to me to be extremely close to HO scale anthracite.
Later, when I had some free time, he showed up in his truck and took me over to the sanding facility, where I filled a couple of plastic bags with the stuff, which "mysteriously" followed me home. :twisted:


:-D:-D:-D
I discovered that it's slightly magnetic (only some of the particles) and quite dense - an Athearn 2-bay hopper loaded with it weighs 8 ounces. It's also much cleaner than the coke breeze which I use for loco coal, and, since most of my locos have can motors, I felt that the slight magnetic properties wouldn't be a problem. I still use the coke breeze for locos, though, as I feel it looks more like the soft coal used for most locos.
Here's a view of the material in a hopper:
And a look at the coke breeze, for comparison:
Wayne