Alex365Dash
Member
On all of Southern’s station welcome posters, they publish the phone number for their control team for customers who require urgent assistance during their journey.I would be very surprised if customer service or the press office answered the phone at 3am, although you would be perfectly at liberty to try them if you wanted to. The Network Rail contact centre would probably not understand the nature of your enquiry, or direct you to the closed TOC customer service line.
This would at least get you to the right team of people, although if the poster is inside the station, it wouldn’t be of much help unless you somehow already knew the number…