. The street railway review . dto be great enough to cover the opposite track. There are brakewheels at both ends of the car, two controllers, two gongs, andthe usual saad boxes are provided. The total weight completeIs 15,000 lbs. The underground railways of London have been brought to theattention of American readers lately by the large orders ior elec-trical appliances placed in the United States. Although the cost ofdriving the tunnels is enormous the traffic in London is greatenough to justify the expense. When compared with the surfacelines the length of the tunnels is very short, with t
. The street railway review . dto be great enough to cover the opposite track. There are brakewheels at both ends of the car, two controllers, two gongs, andthe usual saad boxes are provided. The total weight completeIs 15,000 lbs. The underground railways of London have been brought to theattention of American readers lately by the large orders ior elec-trical appliances placed in the United States. Although the cost ofdriving the tunnels is enormous the traffic in London is greatenough to justify the expense. When compared with the surfacelines the length of the tunnels is very short, with the funkier dis-advantage that each short line is owned by a separate pioneer of these railways is the City & South London Railwaywliich was commenced 13 years ago. Some important extensions arc now in progress and they includethe driving of a tunnel under the Thames river and constructingan underground station beneath a large church. A description ofthis work is given in the London Electrical Review from which. OLD AND NEW TUNNELS, LONDON. the illustration and data are taken. The work of tunneling wascommenced in October, 1886. and it was at the time and in thiswork that the feasibility and economy of the Greathead system oftunneling were demonstrated. In 1888 the hydraulic elevators werecompleted and in 1889 the contract for the electrical equipment waslet. After four years had elapsed the road was at last opened inDecember. 1890. The line consists of two iron lined tunnels which besides passingunder the Thames, in some places go through water-bearing strata,compressed air in combination with the shields having been suc-cessfully used for this portion of the work. Grouting by com-pressed air was first employed on this line for the purpose of fill-ing in the cavity left by the advance of the shield. The rolling stock of the line consists of 17 locomotives and 54cars, their peculiar design being shown by illustrations published inthe Review in September, 1893. In the
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
