. Street and electric railways, 1902 .. . ch. Theswing or draw of the bridge is 160 feet in length, andis equipped with electric motors and trains of gearingso that it can be opened and closed in one and one-halfminutes. The bridge is designed to carry a full loadof 30-ton cars on each track. In general, no figures with regard to elevated rail-roads and inclined planes are included in this table,although it might be claimed that these were whollyof a trestle character or in the nature of a railroads, however, have been considered andtreated sui generis, though some figures wit
. Street and electric railways, 1902 .. . ch. Theswing or draw of the bridge is 160 feet in length, andis equipped with electric motors and trains of gearingso that it can be opened and closed in one and one-halfminutes. The bridge is designed to carry a full loadof 30-ton cars on each track. In general, no figures with regard to elevated rail-roads and inclined planes are included in this table,although it might be claimed that these were whollyof a trestle character or in the nature of a railroads, however, have been considered andtreated sui generis, though some figures with regardto bridges employed by the Brooklyn Rapid Transitsystem in connection with its surface track have beenincluded in the table. Tiuuiels.—Supplementary Table 1 includes also datawith regard to tunnels employed in connection withstreet railway work. There were 27 of these, with anaggregate length of 19,803 feet. Up to the presenttime street and interurban railway work has been almostentirely free from tunnel construction. On grades. TYPICAL ENTRANCES AND EXITS, BOSTON SUBWAY.
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