. Electric Railway journal . par comparaison léger, mais au sud de la porte City le total de la terre à déplacer est grand. Au moment de la rédaction, le classement entre la porte City et Urbana était terminé à 60 %, et le pont, qui comprend un pont-voûte en béton armé contenant des travées de quatre-vingt-dix-pieds, était terminé à 85 %. Tous les travaux de terrassement sont manutentionnés pour 23 cents par yard cube lorsque le transport est inférieur à 500 pieds, avec un ajout de 1 pour cent par 100 pieds pour les transports dépassant 500 pieds. La conception standard de la voie et de la chaussée comprend une chaussée de 16 pieds sur un remblai

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. Electric railway journal . ascomparatively light, but south of La Porte City the totalquantity of earthwork to be moved is large. At the timeof writing the grading between La Porte City and Urbana was 60 per cent completed, and the bridging, which in-cludes a reinforced concrete arch bridge containing nine80-ft. spans, was 85 per cent completed. All earthworkis being handled for 23 cents per cubic yard when thehaul is less than 500 ft., with an addition of 1 cent per cubicyard per 100 ft. for hauls exceeding 500 ft. The standard track and roadway design includes a 16-ft.roadbed on embankments and 24 ft. in excavation. Thelatter width provides for two 4-ft. ditches paralleling thecut slopes, which are l/2 to I, except in rock, when theslopes are varied from y2 to to 1, depending on thequality of the material. For a distance of between 3 milesand 4 miles in the line between La Porte City and Brandonpractically all excavation is through limestone. As soon asthis section of the line is in operation the company in-. Waterloo, Cedar Falls & Northern—Standard Flat-TopArch tends to install a crushing plant to prepare ballast for theentire line. BRIDGES AND CULVERTS All concrete bridges and culverts were designed forCoopers E 60-loading and the wooden trestles meet Coop-ers E 50-loading requirements. The former loading isbased on two 213-ton locomotives each on eight-drivewheels, followed by a 6000-lb. per lineal foot uniform trainload. As these structures are permanent, it was consideredadvisable to design them to meet possible future require-ments. All small waterways were provided with Acmenestable corrugated culvert pipes. When the opening wastoo large for a corrugated pipe a reinforced concrete flat-top arch was built. In a few instances where there wereunstable foundation conditions and the opening was solarge as to require pile foundations, ballast-deck trestlesbuilt of creosoted timber were used. Some interest may be attached to the unit cost figuresfor concrete

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