. The street railway review . 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 all highway cnissings and at cross-over^and similar places it was necessary to di
. The street railway review . 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 all highway cnissings and at cross-over^and similar places it was necessary to discontinue the third rail andallow the car lo cross the break under its momentuni. At the farmcrossings these breaks are 33 ft. long, one rail length having beenleft out of the third rail. Wherever these breaks occur the endsof the third rail arc electrically joined by insulated undergroundcables varying in cross section from ,000 to 50,000 c. m., de-pending iipiiii i1k- prcib;d)le capacity needed at tile indi-. SlDWAV NE.\K ELGIN. vicinal pciiiUs. Part of these cables are insulated with rubber andpart with paper, cmereil with sheathing of lead and protected bywoven iiile. .Some trouble has been experienced with leakageand burning out of the cables as originally installed. This is thoughtto be due to electrolysis of the lead sheath and a possible admissionof moisture to the special terminal which protects the end of thecable and furnishes a connection point for the bond between theends of the cable and the third rail. Several difTerent methods these cables and different terminals have been tried withvarying success. The following described method of inslalling crossing cables hasnow been used for a year and has proven itself to be a safe one:The lead and jute covered insulated cable is drawn through a con-duit of bitnminized fiber and placed in the trench about three feetdeep. This conduit is in 7-ft. lengths with special joints andelbows for turnin
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
