That is the problem with not having the odd spare class 37 or 47 locomotive parked away near strategic locations.
Cost cutting on rolling stock is the prime example here. If not used then get rid of it is the idea.
Powerlines do come down occasionally and the only way to move the train is by means of diesel.
Why on earth does it take them so long to do the repairs? Usually railway power outages are fixed within a few hours!
Health and Safety usually!
Honestly it's all gone insane. If naturally you clamour for repairs to be undertaken more quickly and expeditiously you are an uncaring dinosaur that fails to remember the absolute carnage that occurred in the past when things were fixed within hours.