I'm sure that even in BR days there would be situations where drivers weren't current on all the routes signed from a given depot. And it would be sods law that the diversionary route that they need would be the one that they were due to relearn next week.
The larger depots were often organised into 'links' which certainly
didn't have universal route knowledge.
For example at Nottingham the Links which signed Skegness didn't sign Matlock and vv
As I found out when I issued a diagram which involved a trip to Skegness and back followed by a trip to Matlock and back!
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The staffing of the Liverpool - Norwich line has always been interesting to me. As much as Nottingham crews will disagree with me, I don't believe they should have ended up with the route under East Midlands. The nearest depot to Liverpool is Nottingham. If anything happens in Liverpool such as crew taken ill, incident or a fatality it's at least 2 hours by road to get to the unit on top of finding spare crew. A satellite depot at Liverpool or Manchester makes sense but the costing of additional spare probably makes it unlikely because of accountants as opposed to operational reasons. Norwich as the other extreme end of the service has a depot though so I'm unsure why the western end never ended up with one.
When it was Central, did Crewe men work any part of the Liverpool - Norwich service out of interest?
When the service goes belly up I don't blame EMT for terminating at Oxford Road. I suspect they have tight PNBs at Liverpool so any delay more than 10 minutes will have a knock on effect for the rest of the service.
Crewe men did not get involved. At all. (The guy who diagrammed Nottingham used to sit opposite me at work!)
Manchester men used to work to Nottingham, and the two depots used to watch each other like hawks to make sure the work was 'fairly' divided.
One year the guy opposite me came up with a rebalancing which saved a traincrew (but altered the Mcr/Ntm balance). Being an obstinate sort he pressed on regardless without agreement from the guy who diagrammed the Manchester crews (who sat a few yards away). The result on the first Monday of the new timetable was that some trains had two drivers, and some had no driver.
He was put firmly on the naughty step!