From Fast to Slow at Sharnbrook Jn?

Sharnbrook Junction
To send a Down train on the Up and Down Slow requires Leicester to give a slot . In real life West Hampstead can only request this slot by phone to Leicester PSB, with Leicester normally granting the slot as they see trains approaching without the need for a phone call. The section is quite long so it may be more efficient to send a Down train via the Down Fast - as long as it will not delay anything on that line. Keep in mind the steep gradient over Sharnbrook Summit.

In the simulation, the slot will be granted if a train is approaching on the Down Fast or the Down Slow, regardless of the timetabled routing. The slot will be taken away if the routes set at Sharnbrook Junction take the train onto the Down Fast. There is no facility to phone Leicester in the simulation.

Before 1987 the slow line was a double goods line. The lines were singled and made up to passenger standards, coinciding with the opening of Leicester PSB in 1987. Leicester PSB replaced a number of manual signalboxes on the route (both fast and slow lines) and it's not practical to simulate these on the fringe at the same time as a modern standard. Therefore, artistic license can be assumed for early 1980s eras.