billingborough gnr signal box diagrams
DESCRIPTION
Billingborough GNR Signal Box DiagramsTRANSCRIPT
RAIL 236/665
Signal Box Diagrams
Billingborough North
Billingborough South
May 1891
DESCRIPTION
Billingborough GNR Signal Box DiagramsTRANSCRIPT
RAIL 236/665
Signal Box Diagrams
Billingborough North
Billingborough South
May 1891