In message , at 15:24:02 on Sat, 7 Feb 2015,
Basil Jet 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.

Then that's the one the cyclists go in, silly! ;-)

It's not just the platform, it's the whole station tunnel. Add to that
the "closed" platform-tunnel at the Holborn end is significantly less
accessible than the other (which was used until closure in the 90's)
--
Roland Perry