Could there be a Barking to Enfield service in the future with the same stock on both lines?
Not impossible, but needs to pass several questions:
- Who is the service for? It goes from North London through some heavily residential areas to East London, not really going through any major destination. Not necessarily an issue, since the GOBLIN arguably does the same and yet is overcrowded.
- Are the paths available? Leaving South Tottenham, a train has to cross the oncoming line into South Tottenham station, go across the curve, then cross the oncoming line from Seven Sisters. That will be tricky to path.
- On that point, how many tph? The GOBLIN has a fair amount of freight alongside passenger services; throwing in more trains will be challenging (and you can't really lose more than 1tph out to Gospel Oak, so anything is going to need to be additive, really). And reversing points need to be available - is Barking Riverside being built with enough capacity? Or will it be possible to reverse some trains at Barking and others at Riverside?
- What are the consequences of meshing the West Anglia timetable with the GOBLIN? An issue on one could spill over to the other, which would make things harder to recover.
- Stock - It's an added service on top of what's already running, so actually I think more stock would be required, and there is unlikely to be enough.
Whilst it would be interesting and potentially useful to some, I think it'll be too difficult to pull off. It'd be better to strengthen the interchanges in that area between South Tottenham and Seven Sisters if possible. Not sure how as the main roads are at an awkward angle.