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Roland Perry · February 8th 15, 06:57 AM posted to uk.transport.london

In message , at 11:54:07
on Sat, 7 Feb 2015, remarked:
What I haven't been able to establish is whether the tunnel(s)
between the two stations [Holborn and Aldwych] are two bores, or a
larger bore with two tracks in. Traditionally it would be the former.

Definitely two bores, like the rest of the Great Northern, Piccadilly &
Brompton Railway.

Having spent a bit longer looking at websites yesterday, it's single
tunnels but there's a step-plate junction with X-overs at Holborn.
--
Roland Perry