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 417
Fig. 36. Dwarf Signal Color—Upper arm Red light at night. Lower arm White light at night.Indication—Diverging route is clear, proceed. STANDARD CODE OF SIGNALS. 407
Locomotives
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