Dogsauce
I’ve got Skol but I’m not a Scholar
Such services used to exist, using the overground route via Kensignton Olympia. You used to be able to take a train from Brighton to Glasgow. No Crosscountry on that route since 2008 http://www.theargus.co.uk/news/3749781.Train_services_from_Brighton_withdrawn/-title=Train/
I can remember the Kensington route, think I might have taken one of those trains north when I was working on Imperial Wharf years ago (I had open return tickets from my employer so explored as many route possibilities as I could when going home at weekends - MML, WCML to Tamworth then via Derby, Hertford Loop etc.).
Hadn't realised those services had stopped, but they were WCML trains so always required a change in Birmingham, which was never advantageous for me given the slow speed of cross country services. I'd love to be able to get to Brighton in about 3 and a bit hours.