. Railway track and track work . to derailment. It was therefore not suita-ble for the high speed service for which it had been claimed to be especiallyadapted, and its use did not extend. Stub Switch.—This consists of two movable rails, having the heels (orends furthest from the diverging tracks) spliced to the track rails, while thefree ends slide so as to coincide with the stub or fixed rails of one or othertrack, as shown in Fig. 47. The rails are connected by tie-rods, so as to SWITCHES AND FROGS. 103 act together, and the throw or movement of the free ends is usually 4 or 5ins. They are
. Railway track and track work . to derailment. It was therefore not suita-ble for the high speed service for which it had been claimed to be especiallyadapted, and its use did not extend. Stub Switch.—This consists of two movable rails, having the heels (orends furthest from the diverging tracks) spliced to the track rails, while thefree ends slide so as to coincide with the stub or fixed rails of one or othertrack, as shown in Fig. 47. The rails are connected by tie-rods, so as to SWITCHES AND FROGS. 103 act together, and the throw or movement of the free ends is usually 4 or 5ins. They are usually 30 ft. long, and are spiked to the ties for a certaindistance beyond the heel, this distance being about 5 ft. for a 7%° curveand 12 ft. for a 15° turnout curve. If only hinged by the splice joints atthe heel, the rails will not be curved when set for the turnout, but will re-main straight, thus forming an angle or kink at the heel and toe. Whenspiked for a certain distance (depending upon the frog number) the rails. k—- 55II >j(— - 223~)\ Fig. 47.—Stub Switch. when set for the turnout will be sprung to approximate to the proper toe of each rail rests on a head plate or head chair, Fig. 48, about 10 x 16ins., which has lugs to limit the throw and is also formed to hold the endsof the stub rails and keep them from creeping. These rails should also bebolted together, a filler block being placed between the webs, and sometimesa U strap is bolted around the ends of the webs. Cast iron is liable to frac-ture, and wrought iron or cast steel are preferable, the base plate beingabout 1 in. thick. The head chairs are spiked to a heavy timber head blockabout 8 x 12 ins., 12 to 16 ft. long, the end of which carries the form of switch is neither safe, efficient, nor economical, even whenfitted with such devices as-the safety castings of the Tyler and Cookeswitches, which move with the rails and carry wheels coming along thewrong track, which
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
