. Electric railway journal . ing on this third item will deter-mine the type of construction used. Large city proper-ties usually require deep rails, heavy castings, sharpcurves, tongue switches, and pavements. Interurbansusually require standard-section rails, spring frogs, splitswitches and little or no pavement. Combined systemsnaturally require both of the foregoing. There Is a Wide Difference Between Cityand Interurban Special Work Layouts The fourth item can be traced through item No. systems, especially where double tracked, have agreat many complex layouts. Interurban s
. Electric railway journal . ing on this third item will deter-mine the type of construction used. Large city proper-ties usually require deep rails, heavy castings, sharpcurves, tongue switches, and pavements. Interurbansusually require standard-section rails, spring frogs, splitswitches and little or no pavement. Combined systemsnaturally require both of the foregoing. There Is a Wide Difference Between Cityand Interurban Special Work Layouts The fourth item can be traced through item No. systems, especially where double tracked, have agreat many complex layouts. Interurban systems, on theother hand, have very simple layouts, such as turnoutends, and long, easy, plain curves. Combined systemshave their share of both complex and simple. It maybe of interest to note this difference in character bycomparing the complex city layouts shown in Figs. 1and 2 with the familiar simple interurban turnout. The fifth item in turn, shows the influence of thecharacteristics indicated in items Nos. 3 and 4. The. 2—COMPLICATED GRAND UNION TRACK SPECIALWORK LAYOUT SET UP IN MANUFACTURERSYARD FOR ASSEMBLY complex city layouts, re-quiring heavy castings,deep rails, tongueswitches, sharp curves andexpensive pavement, nat-urally cost more to main-tain than the more simpleinterurban constructionwhere split switches, stiffor spring frogs and easycurves are used ordinarilywith little or no will be seen that repairsto special work of the citytype will require thegreater expense, just asit is also clear that it will require the greater outlayfor original construction, not only for the work itselfbut also in labor cost for installation. As to the sixth item, wheel contours and settingshave a greater bearing on maintenance of specialwork than appears at first. On city systems, thewheel treads are comparatively narrow. (About 21in. is the prevailing width.) On the other hand, in-terurbans or roads operating solely upon private right-of way have cars with wheel tre
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