On 28 Jun, 08:31, Kev wrote:
But lots of the newer kit is bolted on to or "talks to" the Victorian
or kit from the 20's-60's!


Not on the Jubilee Line and that still gets problems.


Err, the kit on the Jubilee line is a mixture of original Met/Bakerloo
signalling north of Baker Street, 1970s kit compatible with the retro
systems between Green Park and Baker Street, and a hastily implemented
bolt-on version of classic LUL signalling on the JLE (built after the
moving block ATO that had been originally planed for the JLE proved
to, err, not work at all).

--
John Band
john at johnband dot org
www.johnband.org