In message , Clive
writes

In message , Paul Terry
writes

There were multiple delays on the Jubilee extension, including
escalating costs, lack of promised finance, and worries about the New
Austrian Tunnelling Method used.

Is that the same method, where the tunnel collapsed under Heathrow?

Yes, and that's the reason for one of the Jubilee extension delays.

But the full moving block signalling had to be abandoned because it
was an untried system developed by Westinghouse, and couldn't be made
to work.

Isn't it moving block on the DLR?

The Jubilee contract eventually went to Alcatel, who had provided a
workable system for the DLR, but the Jubilee solution was not full
moving block (partly because of difficulties integrating with the older
signalling on the rest of the Jubilee line).

Have they got anywhere near getting it working on the Jubilee yet?

I think that most of it is now working.
--
Paul Terry