Well how could it not be the Northern Heights plan...?
The London Underground's Northern Line's northern extremities, were going to be a lot more complicated until WW2 intervened. With two Northern branches- one to the OTL High Barnet and one to ATL Bushey Heath. Plus a third route through Central London via Finsbury Park with another branch to Alexandra Palace.
Much of the works had already been put in place prior to its cancellation. East Finchley station had been quadrupled in anticipation of services via Finsbury Park, and the embankments had been raised north of Edgware to carry the line onwards to Bushey Heath.
Alas, while the Northern Line is still today probably the single most complicated rapid transit line in the world, it could have been even more complicated.
The London Underground's Northern Line's northern extremities, were going to be a lot more complicated until WW2 intervened. With two Northern branches- one to the OTL High Barnet and one to ATL Bushey Heath. Plus a third route through Central London via Finsbury Park with another branch to Alexandra Palace.
Much of the works had already been put in place prior to its cancellation. East Finchley station had been quadrupled in anticipation of services via Finsbury Park, and the embankments had been raised north of Edgware to carry the line onwards to Bushey Heath.
Alas, while the Northern Line is still today probably the single most complicated rapid transit line in the world, it could have been even more complicated.