Stumbling on disaster

I wandered into Rosebank cemetery this evening, having spotted a sparrowhawk being mobbed by crows. Didn't come close to a shot of the raptor but did stumble across this large Celtic cross that's a memorial to the UK's worst rail disaster.
To my shame I had no idea the monument was even there (though given it's in Leith I am of course awaiting the links to previous blips that I've missed).