Ballasting track

[pandsrowe]

This is the horticultural grit that I've used straight out of the bag before washing.

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I estimate that the average grit size is 3 - 4mm, as can be seen some of the grit is a bit larger at maybe 5 - 6mm but they are few enough to pick out if they cause a problem.

[philipy]

Yes, I've got some of that in the garden for potting grit. It's a little larger than my granite, but I've had it in mind for when I run out, although it is a different colour - red rather than greenish.

[Peter Butler]

Sorry to say this but I covered that one too!

Personal experience of using SBR and a variety of ballast materials has given me an insight into what works and what is less likely to.
My own first attempt was to use horticultural grit, which I took a long time to sieve out the larger lumps and only use the smaller. I quite liked the appearance of the grit but it failed in service after a couple of seasons.

I just hope you have more luck..... please update as time goes by.