. The Street railway journal . ral viaduct. In order to compare the various types of floor construction,six such ballasted floors applicable to the loop are shown onFig. 15, designated as types A, B, C, D, E and F. These typeshave all been designed to support a single track only, leavingan open space between tracks for the feeder conduit and thirdrails, except at crossings, turn-outs and junction points, wherethe floor would extend across this space. All floors have beenfigured for 12 ins. of broken stone ballast, weighing 140 cubic foot, and providing for 6 ins. of ballast under theti
. The Street railway journal . ral viaduct. In order to compare the various types of floor construction,six such ballasted floors applicable to the loop are shown onFig. 15, designated as types A, B, C, D, E and F. These typeshave all been designed to support a single track only, leavingan open space between tracks for the feeder conduit and thirdrails, except at crossings, turn-outs and junction points, wherethe floor would extend across this space. All floors have beenfigured for 12 ins. of broken stone ballast, weighing 140 cubic foot, and providing for 6 ins. of ballast under theties. Types A and B are what may be termed ballasted steelfloors. Type C is a ballasted concrete arch floor, and type Ea ballasted concrete steel floor resembling the latest typeadopted by steam railroad companies for bridges. All of theseare solid floors—that is, they form a continuous deckingunder the track. Type F is a type of open ballasted concretesteel floor. The effect of the ballast as used in these various types would.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
