. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . Fig. 213. SHEFFIELD CATTLE GUARD. 322 BUILDING AND BE PAIRING RAILWAYS. doned, surface guards being now used almost ex-clusively. Figs. 211, 212 and 213 representsome of the stj^les used. TRACK SCALES. The revenue of a railv^ay is based on the rateper 100 pounds, and it is therefore vital to havethe weights correct. Car load freight is weighedon track scales, and as the traffic becomes heavyand the schedule faster, the delay caused byweigh
. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . Fig. 213. SHEFFIELD CATTLE GUARD. 322 BUILDING AND BE PAIRING RAILWAYS. doned, surface guards being now used almost ex-clusively. Figs. 211, 212 and 213 representsome of the stj^les used. TRACK SCALES. The revenue of a railv^ay is based on the rateper 100 pounds, and it is therefore vital to havethe weights correct. Car load freight is weighedon track scales, and as the traffic becomes heavyand the schedule faster, the delay caused byweighing becomes annoying to shippers. Toovercome this and permit rapid weighing an at-tachment to the track scales has been made andis known as the Automatic Weighing and Re-cording Attachment. Fig. 214 gives a view^ ofone make of track Fig. 214. RAILROAD TRACK BRIDGES AND CONCRETE STEEL CONSTRUCTION. Arch Culverts: The general practice on newlines, is to carry the track over ravines and thesmaller streams on pile and trestle structures are a constant source of expenseand if not kept in proper repair become danger-ous. As the traffic of a line becomes heavy and STANDARDS OF CONSTRUCTION, 323 the income of a company increases, it is thegeneral practice to replace these pile and trestlebridges by embankments and arched culverts orstone arch bridges. The actual money economy of the woodenstructure as compared with the stone arch culvertis not so great as might be supposed, for the rea-son that although the cost of the pile or trestlebridge is small there is a constant outlay forrepairs; while on the other hand the stone archculvert and earth embankments while costly toconstruct need but little outlay afterwards forrepairs. But even where the cost of each when capital-ized is the same, the stone
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1906
