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Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules (1908)
National correspondence school of railroading, Chicago. [from old catalog] · [Chicago] · leaf 401
STANDARD CODE OF SIGNALS. 389 DIAGRAMS OF TRAIN SIGNALS 39o STANDARD CODE OF SIGNALS.Locomotives
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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