Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 122
-f m fff Locomotive running forward by night. Running Extra. White Light and Flag at l denote Extra. 2—Markers. MANUAL OF TELEGRAPHY. 119 Markers and Eng-ine Signals. … Locomotive running forward by day carrying signal for Train Following. Green Flag at 1 for Train Following. 2—Markers. ^ Me ^ao
Telegraph
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
