. Railway track and track work . ing of a pair of r2-in. channels, 15ins. apart, connected at intervals by horizontal diaphragms of channels-A plan proposed by Mr. J. AV. Schaub provides for a reinforced concrete floor,with the top level with base of rail in the middle. A bench at each side forms aseat for a longitudinal timber 12X12 ins., transverse rods or bolts jsassingthiough the timbers and the middle part of the floor. From the bottom of the 24 TRACK. timber the concrete is extended to the tunnel wall and forms a drain. Themiddle portion of the floor may be hollow, forming a cond
. Railway track and track work . ing of a pair of r2-in. channels, 15ins. apart, connected at intervals by horizontal diaphragms of channels-A plan proposed by Mr. J. AV. Schaub provides for a reinforced concrete floor,with the top level with base of rail in the middle. A bench at each side forms aseat for a longitudinal timber 12X12 ins., transverse rods or bolts jsassingthiough the timbers and the middle part of the floor. From the bottom of the 24 TRACK. timber the concrete is extended to the tunnel wall and forms a drain. Themiddle portion of the floor may be hollow, forming a conduit for pipes, wires andcables. The track would consist of tee rails resting on tie-plates and secured byscrew spikes. The Central London Ry. (England) is an electric underground line with a pairof single-track circular tunnels. The floor is of concrete so shaped as to formbenches or supports for two lines of longitudinal oak timbers 5X11 Ins., with abroad drain between, as shown in Fig. 16. At intervals of 7i ft. tliere are oak. Fig. 16.—Underground Railway; Central London Ry. transoms, 5^X5 ins., between the longitudinals. The rails are CO ft. long, ofbridge section, 7 ins. wide, 3\ ins. high, weigliing 100 lbs. per yd. They aresecured to the longitudinals by fang-bolts 2 ft. 8 ins. apart, alternating on eitherside of the rail base. These bolts have square heads and are screwed downthrough heavy triangular nuts placed under the timbers, the nuts having pointsor fangs wliich bite into the wood, and so prevent them from turning. The railsare laid with square joints, with a ribbed base plate, iX7X20 ins., under thejoint, the rib fitting the hollow of the rail. The end of each rail is held by fourfang bolts, and has also two |-in. holes for the rail bonds. Some of the latertubular underground lines in London have double-head rails in chairs on tiessupported at the middle on a concrete base about 3 ft. wide, with stone ballastunder the ends. The Great Northern & City Ry., howeve
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