. The street railway review . s of Chi-cago to the Fox River valley exceptionally few breaks occur in thealignment, and the roadbed was built with a limiting gradient of Iper cent, this being exceeded in but one short climb out of the FoxRiver valley. .All intcrscctirg have been joined by curveshaving the longest possible radii, so that there are but few portionsof the line which cannot be taken at high speeds. At all railwaycrossings, where possible, the grades of the intersecting lines areseparated. Those crossings at which the grades are not separated areprotected by derails and i
. The street railway review . s of Chi-cago to the Fox River valley exceptionally few breaks occur in thealignment, and the roadbed was built with a limiting gradient of Iper cent, this being exceeded in but one short climb out of the FoxRiver valley. .All intcrscctirg have been joined by curveshaving the longest possible radii, so that there are but few portionsof the line which cannot be taken at high speeds. At all railwaycrossings, where possible, the grades of the intersecting lines areseparated. Those crossings at which the grades are not separated areprotected by derails and interlocking signal apparatus, maintainedjointly with the intersecting steam lines. Track and Roadbed. The construction of the roadbed followed the most thornugh andup-to-date standards of single and double track steam railway prac-tice. Wherever there was sufficient head room, bridges were builtwith ballasted floors. .All piers, abutments and retaining walls areof concrete with steel reinforcement where necessary. The line is. .\ND TRENCH. laid throughout with 80-lb. T-rails of the .A. S. C. E. standard sec-tion, in 60-ft. lengths. The joints are made with 4-bolt angle barsand bonded up to the equivalent cross section with concealed, ex-panded terminal fjonds. The entire line is gravel ballasted excepton the sections near the Fox River, where crushed limestone, takenfrom the cuts, is used. A special per cent carbon steel weighing 100 lb. per yardand supported at a distance of 19]4 in. from the gage line of thesurface rail, and 11 3-16 in. above the ties, serves for the workingconductor. There are several types of third-rail insulators used ondifferent parts of the system. Each type has its advantages and dis-advantages. Those having wood as an insulating medium have occa- May 15, igos,] STREET RAILWAY REVIEW. 1^87 sioiKilly caiiKlit liri .iiul Ijiirncd, wliilc lliosc using special iiisiilalingconipoiUKls have di-vcloped a mechanical weakness. Al the wing fences of
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
