Expanding Central will be an expensive,long and disruptive task.Given that most of the problems stem from the need for two out of every three trains to run forward before a new departure,perhaps any available funding would be better spent on establishing the link to the Wapping Tunnel ?Trains could then run-through Central on their way to St.Helens /Wigan or even Manchester (dual-voltage ?).Many London tube stations handle a train every few minutes and despite Central being an island platform,I'm sure it could do the same.
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Another idea:An eventual link to John Lennon Airport could use some of the available space on the High Level site.A single platform would probably suffice whatever the configaration chosen,or even as a route for tram-trains to gain access to the City.
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