It comes down to what we call spiking the switch, so it can't be reopened, which is not that expensive, but you still have to inspect the switch once a week. Because if for some reason that spike were to come out and that switch were to be open in a reverse position, and you have a freight train going down that line at 50 miles an hour, it's going to derail.
On October 22nd, 2009. See this statement in context.