In message , at 23:17:16 on Fri, 6 Feb 2015,
Peter Smyth remarked:
The problem with a Holborn-Aldwych cycle route is that unless the
Holborn end is for Piccadilly Line passengers, the round trip
surface-tube-surface will take longer than walking. And don't let us
forget one the main reasons Aldwych closed was it was too expensive
to repair the lifts. Finally, what about the tidal flow of
Boris-bikes - what tooth fairy is going to be shuttling them back to
the other end so that more than a couple of dozen people can use the
route each morning or evening?

It's obvious - you run a train on the other track to take the bikes
back!

Although built for two tracks, there's only one, and also massive
restoration work would be required to bring the second platform at
either end back into use.
--
Roland Perry