The New York Rapid-transit Subway

Proceedings.] DISCUSSION ON NEW YORK SUBWAY. section, which in service was found to be flexible, concentrating The Author, pressure on its bolts. If they held, the check-rail would bend between the joints, causing lateral motion and corrugated wear on the track- rails. These flexible guard-rails had been replaced by 100-Ib. rails of the normal section, which had overcome most of the troubles of this character. In fact, on the City Hall curve the life of tie rails had been increased from 3 months to 4 by the stiffer guard- Fig. 22. Wear or a Rail at City Hall Loop. (Life of rail, 3 months. Radius of Curve, 147 feet. Gradient 1 in 77 down. Traffic, 7 million tons. Average speed 11'14 miles per hour.) WEAR of Rails at Great Central Station. (Life of rail, 4 months. Radius of curve, 220 feet. Gradient 1 in 87 down. Traffic, 13 million tons. Average speed 18'2 miles per hour.) rails Corrugation at present appeared to be due to braking and accelerating on curves. Where these took place corrugations were found, ranging in length from 12 to 36 inches, and of various depths up to inch. Sometimes the corrugations on the inner and outer rails differed, those on the former being longer but not so deep. On curves where there was no braking or accelerating, corrugation if present was quite irregular, sometimes but a single rail being affected. In reply to the several questions by Mr. Fitzmaurice, the