Signalling
NICHOLSON, Mick
Constructing & Operating Semaphore Signals
Mainline Modelling No. 1
POPE, R.
Signalling the Layout - British Railways Practice
The Institution of Railway Signal Engineers Booklet No. 27
PRYER, G.A.
Signal Boxes of the London & South Western Railway - A Study of Architectural Style
Oakwood Series X68
PULLEYN, Richard
Signalling Centres in the North-East - York from Early Days to Rail Operating Centre
Signalling Centres in the North-East No. 1
