> Systems were up within an hour, but if you throw an hour's delay into a busy part of the rail system, you have knock on effects (trains aren't where they are

> Systems were up within an hour, but if you throw an hour's delay into a busy part of the rail system, you have knock on effects (trains aren't where they are supposed to be) that will basically last until the end of the service day. And at a location where almost all lines are running at near capacity you can't "catch up" by getting more trains through the location once things are working again to get stock back in place, you can only get the regular timetable through it.