. The Pennsylvania railroad: its origin, construction, condition, and connections. Embracing historical, descriptive, and statistical notices of cities, towns, villages, stations, industries, and objects of interest on its various lines in Pennsylvania and New Jersey . and Pittsburg iron bridgeswere erected when the road was first bridges have been gradually re-placed with iron structures on the otherportions of the road as renewals were re-quired, until now there are only four woodenbridges remaining; and on the main line,between Philadelphia and Pittsburg, thereare at present
. The Pennsylvania railroad: its origin, construction, condition, and connections. Embracing historical, descriptive, and statistical notices of cities, towns, villages, stations, industries, and objects of interest on its various lines in Pennsylvania and New Jersey . and Pittsburg iron bridgeswere erected when the road was first bridges have been gradually re-placed with iron structures on the otherportions of the road as renewals were re-quired, until now there are only four woodenbridges remaining; and on the main line,between Philadelphia and Pittsburg, thereare at present one hundred and seventy-threeiron bridges. The plans for each bridge arecarefully matured by the engineer of bridgesand buildings before being ordered, and the repairs that may be necessary. Accordingto the present practice, for small spans upto twenty feet, the bridges are constructedof solid-rolled I beams, two under eachrail; from twenty to seventy feet length,built girders of boiler plate are used; andfor spans over seventy feet, open iron is used entirely,—no castingsbeing employed except for ornamental are eight tunnels on the main line,all carefully arched where necessary, of thefollowing lengths in feet, respectively:—two. U. S. POSTAL CAR, PENNSYLVANIA RAILROAD. CONSTRUCTION OF ROLLING STOCK. 27
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectpennsyl, bookyear1875
