Manual of recommended practice for railway engineering and maintenance of way (1905)
American Railway Engineering and Maintenance-of-Way Association · Chicago, Ill. : The Association · leaf 87
speed movements be governed by low signals. (3) That only two high-speed signals be displayed on one mast,the top arm to govern the unrestricted speed and the lower arm togovern all other high speeds. (4) That all low-speed movements be governed by one-arm lowsignals of dwarf construction. - - (5)… … FIG. 5- FIG. 4. STANDARD SEMAPHORE ARM FORTRAIN-ORDER SIGNAL. J
Railroad engineering · Railroads
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