. Electric railway journal . Arguments favoring the latter fillerare that it is not only impervious to water but is as hardas the paving. This quality protects the edges of brick,wood or granite block and results in longer life and asmoother pavement. Most of the street railway corn- high temperature the paving has buckled. This has beenovercome, however, by an increase in the space allowedfor expansion, and some street railways allow as muchas % in. between the rails in standard-gage track. One objection to both brick and creosoted wood blockas compared with granite block is that much of it i
. Electric railway journal . Arguments favoring the latter fillerare that it is not only impervious to water but is as hardas the paving. This quality protects the edges of brick,wood or granite block and results in longer life and asmoother pavement. Most of the street railway corn- high temperature the paving has buckled. This has beenovercome, however, by an increase in the space allowedfor expansion, and some street railways allow as muchas % in. between the rails in standard-gage track. One objection to both brick and creosoted wood blockas compared with granite block is that much of it isbroken when it is necessary to make repairs. Hence alarger percentage of new material is used than is requiredwhen similar repairs are made in granite block pave-ment. To offset this advantage in granite, other engi-neers claim that the fact that wood block may be cut tofit around special work is worthy of consideration. A common form of pavement failure encountered inthe Northern States is from upheavals during periods of. Laying Granite Block Paving on Mortar Bed, United Railroads of San Francisco panies using granite block where vehicular traffic is heavyalso use it to a limited extent in residential or lightvehicular traffic sections. The usual method is to lay aheader course along the flangeway and a stretcher coursealong the outside of the rail. The rest of the pavingconforms to that specified by the city. Recent experiments with a solid concrete paving sur-face in the track allowance have been quite successful,and the cost of paving this strip has been materially re-duced. This paving surface is applied at the same timethat the foundation is put in place and does not require aspecial class of laborers to do the work. The fact thatthe concrete gang can complete the paving not only re-sults in economy in material and labor but also expeditesthe completion of the work. Creosoted wood block is gaining in favor as a pavingmaterial in the track allowance, both for heavy and l
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