. Railway age . ectly underneaththe sleepers, where the chairs rest, is confined laterally in the wheel pressures on the rail tend in a degree to drive this granitetoward the sides of the tubes, but gravity acts in the reverse direc-tion, tending to continually tamp the granite underneath th result is what might be expected: A track firmly supportedbut with a slight elasticity, or rather resiliency, that is useful inmodifying shocks and reducing noise. The amount of this elasticity can be accurately Australian jarrah wood is used for the sleepers. Each sleep
. Railway age . ectly underneaththe sleepers, where the chairs rest, is confined laterally in the wheel pressures on the rail tend in a degree to drive this granitetoward the sides of the tubes, but gravity acts in the reverse direc-tion, tending to continually tamp the granite underneath th result is what might be expected: A track firmly supportedbut with a slight elasticity, or rather resiliency, that is useful inmodifying shocks and reducing noise. The amount of this elasticity can be accurately Australian jarrah wood is used for the sleepers. Each sleeperhas two fulcruras immediately beneath the inside of the inner linesof the chairs, so that the rolling loads on the rails have a leverageof a few inches, and each sleeper with its fixed center acts as aspring. of this spring action in the sleeper can be ac- Surface ffai/roads —Metropotitan ffaifufayt^i^^ District oncf Tube ffai/tvai/i fubas Under Consfrvcf/on Tubes /iufhorized /ntsrchonge Sfafons O. London Tubes and Subways. where tlic wheel jiressure is transmitted through the sleepers toI be iiallast and can drive the ballast .-iupporl downward and later-ally from underneath the sleepers. The undertaking in designingIbis novel form of track was to prevent the jar, tremor and noisowliich had resulted in other deep tube construction In London,:md which had proved to l>e not only an annoyance to passengers,but costly in damages and law suits with owners of nearby proi)-l)erty. It was plain that if this could be avoide<I at any reason-able cost, the result would be a more attractive transportationnuichine accompanied with less cost. The novelty consists in bedding the sleepers and fastening themto a cement grout center bearing, which clasps the sleepers firmlyfor a distance of 3 ft. 10 in., and furnishes a somewhat resilientsupport for the sleepers directly \inder the rail ihairs. The sup-port directly under the rail consists of clean crushed granite brokenso
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
