at|ing. It was also necessary to erect a large number of temporary trusses above the depressed tracks to assist _ a in carrying the floor of the viaduct during construc- tion. The viaduct is carried upon three rows of latticed columns, the outer row being built on the line of the old retaining… … THE VIADUCT AND TEMPORARY TRACKS NORTH FROM ONE HUNDRED AND TENTH STREET STATION. columns. In order to carry the center girders, tem- porary wooden trusses were thrown across the tracks, beneath the drawspans necessitated frequent openings, | Ninety-eighth Street down to the grade of the old| the…
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