Signalling
PULLEYN, Richard
Signalling Centres in the North-East - York from Early Days to Rail Operating Centre
Signalling Centres in the North-East No. 1
Southern Railway
Extracts from Block Regulations also Particulars of Modifications in Single Block Working etc. for the information of Drivers, Firemen, Guards and others concerned, February 1930
SUCH, W. H.
Mechanical and Electrical Interlocking (British Practice)
The Institution of Railway Signal Engineers Booklet No. 3
SUCH, W. H.
Principles of Interlocking (British Practice)
The Institution of Railway Signal Engineers Booklet No. 2
TYLER, J. F. H.
Signalling Relays (British Practice)
The Institution of Railway Signal Engineers Booklet No. 6