History, theory and practice; requisites for highway-crossing signals; flashing-light type; wig-wag type; maintenance; highway-crossing gates; crossing watchman's annunciators. From Am. Ry. Assn's book, Am. Ry. Signaling Principles and Practices, chapter 23, Highway Crossing Protection.
Highway crossing protection
Int. Ry. Congress Assn. -- Bul
1928
15 pages
16 Figs.
Aufsatz (Zeitschrift)
Englisch
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