I agree that the line into Moorgate needs a far better evening and weekend service.
Old Street especially could justify with more passengers using the station visit bars around the area. The Waterloo and Cityline is getting a much improved service after all these years so there should be some demand in the city for evening and weekend services if people are putting in some additional overtime at the office.
A freqeuency of 4-5tph (every 12-15 minutes) should be enough in the evenings and weekends unless there is any major events going on. Once traffic has built up perhaps a higher frequency could then be justified.
Running these trains into Moorgate should free up some capacity at kings cross
You'll struggle to increase the frequency to more than every 10 mins - there's precious little capacity north of Finsbury Park.
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There isn't. It's twin tube tunnels with the only two-way crossover being at Moorgate itself, with one-way crossovers either side of Drayton Park. I don't think it's possible to terminate partway down the branch.
Well, when BR initially took over the line they did terminate at Old Street - because works were still taking place at Moorgate.
I assume they ran the trains onto Moorgate as ECS and reversed them there?
The real shame of this branch is it can't be extended to anywhere more useful. At least if it had an end destination of south of the river it would open up some journeys - but at weekends Moorgate's a pretty pointless destination.
The bigger shame, having said that, is the way the NLL has been reworked, so it's not viable to route the GN Inners onto the NLL to either Stratford or the ELL.