Regulations for "special working" over a line in the wrong direction during repairs or obstruction : November, 1919.
Great Northern Railway (Great Britain)
Pulborough : Dragonwheel Books,
2006.
Facsim. of '"Special working" Regualtions to be observed for working traffic over a line in the wrong direction, during repairs of obstruction, in cases where there are more than two running lines and when two or more lines in one direction only are left unconstructed' published 1919 by the Great Northern Railway.
Great Northern Railway (Great Britain)
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