ity, 4J miles, and the avenue grades is greater than 19 feet, while the beam tun- without batter, are twenty inches thi:k and high enough to route of its authorized extension down town, under Broad nel is usad, with a slight alteration of the street grade, at receive the roof beams, and are tied… … Fig. 6-THE UNDERGROUND RAILWAY. NEW YORK CITY-BEAM TUNNEL OPENINGS ON FOURTH AVENUE, 59th TO 76th STS. Along the top of each of these two inner walls run, side by consequence, more than five thousand feet, of what would railway, showing its grades, depths below surface, street side, the flanges…
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