If only it was as straight forward as that. Drivers on LNER invariably only have route knowledge for their own route, so to travel on say East Midlands into St Pancras, or the Anglian lines into Liverpool Street, LNER would have to hire in Pilot drivers toguide their drivers from other TOCs to those station. Likely those TOCs only have enough drivers for their own trains. Then you have line capacity. Does St Pancras/Liverpool STreet and the lines leading to them have room to run additional trains without affecting other TOCs trains. Are the terminating stations equiped to take the extra flow of passengers as a result of diverted trains.Maybe this is a dumb question, but it's just kinda wild to me that the connection to London, the capital, from an entire major mainline could be closed for 4 entire days. Was there no chance for any of these operators to divert into different termini or stations in London?
The easy option for TOCs is to not bother and tell passengers to not travel.
It is interesting that there is mention that weekends are for leisure travel. There are lots of people who travel into London at weekends for work, emergency services, rail workers and many people who simple work in the leisure industry in London. Up to last year I was a regular commuter for work, seven days a week. I was constantly late or having to use Annual leave at weekends because the TOCs weren't running trains, or if they were running some limited service it was taking me three hours to travel a mere 60 miles. I had to use hotels a lot of weekends because my employer would not accept me being late for work. In the end I took early retirement as the cheaper option. My employer was Network Rail.