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The science of railways (1904)
Kirkman, Marshall Monroe, 1842-1921 · New York, Chicago, The World Railway Publishing Company · leaf 313
309 CONSTRUCTING TRACK. Fig. 229. SINGLE THROW SPLIT SWITCH No. 10; RIGID FROG 10 FEET LONG. … Fig. 230. SINGLE THROW SPLIT SWITCH No. 11; RIGID FROG 11 FEET LONG. Fig. 231. SINGLE THROW SPLIT SWITCH No. 7; SPRING RAIL FROG 15 FEET LONG.Railroads · Transportation
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