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With the Victoria line pushing towards what must be the theoretical limit for a line with that amount of rolling stock and – more importantly – two-platform termini, there are no plans to further improve the service.

Clearly this won’t improve capacity into central London (as the trains would fill up anyway further down the line) but it will make the line easier to operate and provide a better service to those who board and alight east of Seven Sisters.

A huge increase in usage at Walthamstow Central due to changing travel patterns and area demographics means it is now busier than Seven Sisters.

On the Central line, in particular, at least a sustainable 34tph should also be possible post-upgrade.

World Class Capacity is in fact Tf L’s project to combine upgrades on the Jubilee, Northern and Victoria lines.

The changes on the Victoria line may not have been dramatic but they been continual and, even if change has been gradual and incremental over many years, the line is a vast improvement on what it was just five years ago.

Currently the Victoria line runs trains every 105 seconds in the peak between Brixton and Seven Sisters.

The reason for this urgency appears primarily to be that signalling procurement for the Piccadilly, Waterloo & City, Bakerloo and Central lines is now on the critical path. Here we will look at the other significant item to which it is closely related – train procurement (or the potential lack of it) in service of London Underground’s “World Class Capacity” upgrade.