NR go up and down the country daily, measuring many things and landslides will certainly be one of them, but there are so many parameters that can cause them not just weather, I don't see it any different to a tyre bursting suddenly on a car for instance. Three people have lost their lives and are not going home to their families, the only thing that would have stopped this happening would have been not running at all, then what would be the point of running a railway at all?