Last updated on
18th November 2020
A selection of diagrams showing the signalling arrangements
for sections of the Northern Line at different times throughout its history.
Northern Line Extensions 1939-1941
A large diagram showing the
details of signalling on the Northern Line
between Archway and High Barnet when LPTB
services were extended over the former Northern
Heights Line in stages between 1939 and 1941. Make sure you zoom in to see all the detail.
Northern City Line
A pair of diagrams showing the
signalling on the Northern
City Line (Finsbury Park to Moorgate), both before and after the construction of the Victoria Line.
Most of the diagrams are in PDF format and to open them you
will need Adobe Acrobat Reader. If you do not already have this it can be
downloaded from the