Other wise it's Network Rail. Signalmen now have virtually no discretion to regulate trains.
So if the stopper is on time and the fast is late guess which goes first?
I was agreeably impressed a couple of weeks ago. Picture the scene - a late "125" from Westbury heading for London, comes to a crawl before Bedwyn then a near stop ... "we're behind a local train that's due to arrive in Reading at 12:15" annouonced the train manager. But - top marks to someone (or the system) - the Bedwyn train looped near Kintbury, and we speed past.