Doesn't granite based ballast have magnetic qualities which do not play well with early open frame motors? Not that there are many of them still roaming around.
I'm closing in on the need to ballast a whole lot of track and many yards. After purchasing several large containers of commercial ballast I am open to an alternative. How do shingle granules compare?
While i have ballasted my entire right of way, i did NOT ballast my yards but rather left them with nothing more than dirt on the ground. In some yard areas i lightly (and not so lightly) sprayed some flat black from a distance to simulate oil stains.