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Had the original Northern Line extension plans been fully realised the Alexandra Palace line would not have been a branch from the current Northern Line at Highgate, rather it would have remained a branch from the original route to High Barnet & Edgware which ran from Finsbury Park (where...

My best guess as to the possible intended function of No. 23 lever would be to allow shunts to and from No. 24 road via OZ17 and OZ24. In this scenario I would imagine that reversing No. 23 lever would allow Nos. 17 & 24 signal levers to be reversed simultaneously (with 22 points lever normal)...

The film 'All that Mighty Heart' has a few shots inside the line controllers offices. Although filmed in the 1960s, I believe the offices depicted dated from just before the period you are interested in. In the clip below the control offices can be seen at 3mins 34secs and again from 10mins...

Co-acting signals of this configuration were first installed at Chalfont (JT25 & JT25 Co-Acting) and Chesham (JV17 & JV17 Co-Acting) in April 1949. This was in connection with the continuous track circuiting of the Chesham branch, which allowed the existing electric train tablet installation to...

There were indeed S8-1s used for testing infrastructure changes on the Hammersmith & City and Circle lines before any genuine S7s were available. As far as I know the S8-1s never ran in passenger service before reverting to full length S8s.