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Analysis of railways: consisting of a series of reports on the twelve hundred miles of projected railways in England and Wales, now before Parliament : together with those which have been abandoned for the present session; to which are added, a table of distances from the proposed London termini to eight well-known places in the metropolis; a table exhibiting the length, cost, tunnelling, curves, etc., of each of the railways for which bills are now in progress through Parliament : with a glossary; and other useful information / by Francis Whishaw
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GLOSSARY.

291

TURNPLATE,

Or turning platform, is a horizontal and circular frame of wood,movable on a centre; it is furnished with a floor of the samematerial, on which are fixed short rails, at a guage correspondingwith that of the railway where it is set up. The use of this con-trivance, which is by no means of recent introduction, is to alterthe direction of an engine or carriage, at any angle that may berequired. On the Stockton and Darlington Railway, these turn-plates are 10 feet in diameter. At the Manchester and Liverpooldepots, there are turning platforms 5 feet in diameter.

TURNPIKE-ROAD.

There are so many turnpike-roads required to be altered, inconsequence of the general introduction of railways, that the sizeof arch to carry these roads under the latter, is a question worthyof especial attention.

The Metropolis Roads’ Commissioners require, in the act of eachrailway traversing the roads under their management, a clausewhich fixes the clear height at 18 feet, and the width at 30 feet.In the neighbourhood of a city, or large town, these dimensionsshould be strictly adhered to. It is well known that some of thehighly-laden waggons which leave London , especially for thewestern portion of England, are too high to pass under the arch ofTemple Bar, whose extreme height, in the clear, is 17 feet9 inches. At Manchester, the bridge over Water-street, which isabout 16 feet in height, is found inconveniently low. On mostturnpike-roads, however, 16 feel will be found of sufficient height,but the shape of the arch should be semi-elliptic, or, which isbetter, a horizontal iron bridge should be introduced. The ad-vantage of this is, that uniform height is preserved from one sideto the other.

On the Holyhead road, the height of Birmingham Railwaybridges is about 16 feet in the clear.

The following statement will furnish engineers, and others in-terested in this question, with data for their guidance.

Temple-bar is 17 feet Pinches high and 21 feet 3 inches in span.

The gateway of the Angel Inn, Earringdon-street, is 18 feet6 inches high and 8 feet in width.

The entrance to the Rose Inn, Fairingdon-street, is .13 feethigh and 7 feet 9 inches in width.

 
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