. The Street railway journal . company now knowthat even this can be accomplished with an energy expen-diture per ton-mile of less than 120 watt-hours. In thecase of the express trains, the investigations have shown RYE NECK 1300 65 1 , 1 1 1 1 1 sioners, one of the diagrams is included in the illustrationspublished this month. It should be stated that while this style of bridge is un-usual in railroad work, one of this type has been in use forabout four years to carry eight Michigan Central tracksover a street in Detroit. The United States Governmenthas also just finished the erection of one
. The Street railway journal . company now knowthat even this can be accomplished with an energy expen-diture per ton-mile of less than 120 watt-hours. In thecase of the express trains, the investigations have shown RYE NECK 1300 65 1 , 1 1 1 1 1 sioners, one of the diagrams is included in the illustrationspublished this month. It should be stated that while this style of bridge is un-usual in railroad work, one of this type has been in use forabout four years to carry eight Michigan Central tracksover a street in Detroit. The United States Governmenthas also just finished the erection of one of these bridgesover the Jacagaus River in Porto Rico. The total lengthof this latter bridge is 320 ft., made up of two spans of 100ft., and one of 120 ft. There are about 100 of these bridgesnow in use in this country, and about 300 more in cost of a concrete bridge is about 80 per cent that of asteel bridge, and it is considered more durable. A full de-scription of the strain sheet published, and the method of RYE. 20 30Street FIG. 4.—RUN SHEET FROM RYE NECK TO RYE that, by increasing the schedule time a few seconds, theenergy consumption can also be brought down to consid-erably less than 120 watt-hours per ton-mile. From the above it will be seen that, by the scientific andintelligent use of the speed-energy-time curves in deter-mining the results under various conditions of operation orservice, it is possible to predetermine the results whichmay be anticipated in actual use, and definitely determinethe most economical and satisfactory conditions of opera-tion of any system. Following these run sheets, a typical stress diagram ispublished of one of the concrete bridges to be used on theNew York & Portchester line. Readers of the article inthe last monthly issue will remember that reference wasthere made to the proposed use of a concrete bridge in-stead of the ordinary girder or truss steel bridge. As theconcrete bridge is unusual in railroad construc
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
