. Railway track and track work . mins.) ^ Frog num-ber. The degree of turnout curve = Frog angle 57^ 2yg 606 Leadinstationsof 100 ft. N ^ 100 R^ or. in round numliers, 600 -4- square of the number of the frog. If the turn-out be from a curved main track, add to the degree thus obtained the degreeof the main curve, if the turnout is to the inside of the curve; and subtractit, if to the outside. Most railways have standard plans and tables of turnouts, and Table has been compiled from the diagrams of the New York, New Haven <& 428 TRACK WORK. Hartford Ry. The reference letters are given
. Railway track and track work . mins.) ^ Frog num-ber. The degree of turnout curve = Frog angle 57^ 2yg 606 Leadinstationsof 100 ft. N ^ 100 R^ or. in round numliers, 600 -4- square of the number of the frog. If the turn-out be from a curved main track, add to the degree thus obtained the degreeof the main curve, if the turnout is to the inside of the curve; and subtractit, if to the outside. Most railways have standard plans and tables of turnouts, and Table has been compiled from the diagrams of the New York, New Haven <& 428 TRACK WORK. Hartford Ry. The reference letters are given on Fig. 217. The switch railsare all 15 ft. long, except for turnouts with No. 15 frogs; these are 24 ft. long,14 ft. being straight and 10 ft. on tlie turnout curve. All the switches havea throw of 3| ins. The rigid frogs have a spread of 5 ins. at the toe (G), and10 ins. at the heel (H), while the spring-rail frogs have a spread (G) of 9| ties are 7X9 ins. The guard rails are 15 ft. long, being straight for 9 ft.,. with a flangeway of If ins.; each end is flared to give a flangeway of 2§ 18 ins. from the straight portion. In turnouts of the Lehigh Valley Ry.,the spread of the switch at the heel is uniformly 6 ins. The standard tableand diagram of the Baltimore & Ohio Ry. are given in Fig. 219, and somenotes accompanymg this table are given below: Spring-rail frogs are to be used in main tracks at high-speed points Whenthe turnout is used at comparatively low speeds; also on turnouts for busi- SWITCH WORK AND TURNOUIS. 429 ness tracks, etc., from passing sidings, ami in general where the trafhc on onetrack is much greater than on the otlier. Hard-faced rigitl frogs are to be usedat end of double track and similar places when both tracks are subjected toheavy traffic at high speeds. All No. l(j to No. 20 frogs inclusive shall be ofhard-faced construction. Sliding-wing frogs are to be used where the trafficIS slow and heavy on both tracks, as on yard ladders and
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