Comparative merits of various types of grade crossing protection; "gates-not-working" and "watchman-not-on-duty" signs; barrier type of grade crossing protection, including automatic gates; lamps on manual and automatic crossing gates.
Report of committee IX -- Highways
Am Ry Eng Assn -- Bul
American Railway Engineering Association -- Bulletin ; 39 , n 401
1938
9 pages
Aufsatz (Zeitschrift)
Englisch
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