Of course, every situation is going to be very different, so we can't really point at a number of minutes or hours. I'll give you a couple of examples. Typically, we handle situations very efficiently and the train continues on its journey to destination, and sometimes we evacuate people off trains. If there's a freight train derailment, for example, in front of our train, we'll take measures right away, because we know that it's going to take a long time to reopen the track.
It really depends on the situation. For some of them, we can see that within an hour, two hours or three hours the track will be passable again. In others, like in this case, we didn't know, and we should have done something different.