I was just thinking of this, even maybe longer although maybe not overly long. Perhaps the stations will be even more spaced out in Central London than the current Victoria Line to make it a faster line. The main issue I see with this idea is that the core stations would have to become interchange hubs rather that stations people aim to get off, as they have wide distances between them, so station capacity would be an issue especially if it had similar frequency to the Victoria line. Prioritising quick interchanges, like the Vic Line has, would be harder or even impossible so I think the core stations would be hard to get correct if the line was to achieve what the Vic Line does and might in fact make the core tube network more congested if stations were spaced too far apart. I think it would be easily effective at bringing people to the city but then moving passengers around the city is probably just as important.
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