Right until closure, the line from South Pelaw Junction, all the way to Consett was signalled using semaphore signals although colour light signals were in use on the approach from Ouston Junction from the 1960s.
The subject of signalling is far too complex to go in to on this site but, suffice to say, the North Eastern Region Railway company, who originally built the line, liked complex signals as the photo of the gantry at Stella Gill further down this page shows.
Below is the Signalling Diagram for South Pelaw Junction from 1963 when the South Pelaw Colliery sidings (to the top of the diagram) and all of the Stella Gill Sidings were still in use. The line from the Ouston Junction and the East Coast Mail Line comes in from the bottom left with the climb up to Consett starting bottom right.
Reproduced with permission from John Hinson
The 1970 signalling diagram for Carr House West can be found here: https://signalbox.org/diagrams.php?id=814 and the 1950 diagram for Carr House East here: https://signalbox.org/diagrams.php?id=815
Signals on the Line
The distant signal, situated at the top of Pelton Bank, for the down line to South Pelaw Junction from Consett. (1985) Photo copyright Mark Goadby
With the abandoned site of Stella Gill sidings in the foreground, a bracket signal which used to control access to the junction for trains approaching from Consett. (June 1984) Photo copyright Mark Goadby
Photographs of the front of the South Pelaw signal box are relatively rare. Taken in 1982 by which time some of the junction trackwork had already been lifted. Photo copyright Mark Goadby
With the bridge carrying Pelton Lane in the background, a bracket signal stands unused on the approach to the junction (June 1984). Photo copyright Mark Goadby
Stella Gill Flatts Signal Box and the signal gantry that controlled the 30+ sidings in Stella Gill Yard. Behind the signal box is the NCB sheds which still stands today and to the right of that is part of Stella Gill Coke Works. Photo copyright Keith Hoult