Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 119
Locomotive running backward bynight without cars.Carrying Signals for Following Train.Green Lights and Flags at 1 — 1 Signals.2—2 Markers. Locomotive running backward by night without cars. Running Extra. Denoted by White Lights and Flags at 1 — 1. Markers at 2 —2. J D o -OK d
Telegraph
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