Whilst I think most passengers would appreciate that you get problems like this, I think they would expect that there would be a contingency plan that means trains don't sit in the countryside for 2 1/2 hours.
The permutations of what can fail or go wrong are endless therefore it is impossible to have and off the shelf plan of action for every eventuality.
To nights problem seems to be a major signaling power supply failure, signaling power supply systems do have backup supplies but if the problem is with the main switchboard in a power signal box or
IECC▸ then there is not much that can be done except fix the equipment in the switchboard, in the mean time all that the signal and other traffic personnel can do is attempt to move trains basically one at a time out of the affected area this is something that has to be done with extreme care.