The Signalling Record Society
ELR to RailRef Correlation - ELR Codes X
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Signal Fact 16
An early form of Block working was introduced to control traffic passing through Box Tunnel by the Great Western Railway in 1847.
|XRC||Crossrail Central Section|
|XRS||Crossrail South Section|
|XTD||yes||Charing Cross - Dover Western Docks||SE001