GNR MSL Manchester Shef Lincolnshire RAILWAY PEGGING BLOCK Signalling INSTRUMENT
Block Signalling PSU1 12v Power Supply BNIP
ORIGINAL RAILWAY PEGGING BLOCK Signalling INSTRUMENT BASE PART
6x Block Signalling 12v DC Power Supply-For Ekon Signals etc-PSU1.
8x Block Signalling Infra Red Aspect Signal Controllers-ASP2A.
Absolute block signalling operations west of Falkirk - Rail magazine article