The York Rail Operations Centre (ROC) - the big new building next to platform 11 - has workstations that cover not only York itself but the ECML north and south, the Leeds line, Leeds station and fringes with other signal boxes on all routes out of Leeds and all of the Aire Valley lines to north of Skipton. This requires a whole load of repeating kit and safeguards to 'prove' within the signalling that points, signals and track circuits are working as expected. If the link between the detection on these items and the ROC goes down, then everything is designed to fail safe - signals to red and level crossings down for road users. It follows that if you want to manually and exceptionally override the signalling safeguards to allow a train to detrain in a platform, there are a very comprehensive set of procedures to go through to ensure that there are no conflicting movements authourised and every movement of a passenger train over facing points is made guaranteeing that these points are locked so they can't inadvertantly move under the wheels of a train, even potentially if some damaged signal component from the lighting strike allowed a stray current to the point motor. So each point has to be manually cranked to the desired position and then 'scotched and clipped' - i.e. mechnical devices applied to the point blades to physically guarantee no movement. This might be a pain and will take some time, but please don't have a go at the poor staff on the ground charged with these responsibilities. By their nature, these incidents are all unique and staff need the time and thinking space to operate safely without being hassled to hit a certain time deadline. Otherwise, to compound the already bad problems, you then have the potential for a derailment as well. This actually occurred on the District Line at Ealing Broadway not too long ago - derailment due to full route not being secured for an exceptional movement in a signalling outage.
The advice not to travel should be heeded - by now this incident will have created a national knock on in terms of late running and rolling stock out of position. By far the biggest challenge will be in deployment of train crew, who will all by now be stuck in the wrong places running out of duty hours. So it will not recover for the rest of today and any trains that do start running have the potential to be short formed. So don't travel today - which is the advice that has already been given. Even if it all came back now, many signalling areas run in Auto Route Setting - ARS - mode. For this to work, each train has to be correctly described with a headcode in the system. In times of high disruption, ARS will have to be switched off while the service recovers, which will put more work on the human signallers normally overseeing it and this in itself will cause further disruption.
In terms of the ROC going forward, it will be interesting to see how Network Rail provides greater resilience, disaster recovery and remote mirroring/duplication of critical systems.