. Railway track and track work . , the con-necting rod from the switchstand is fastened to a strap surrounding a stiff spiralspring carried by the head rod. The rod passes through the spring, which is 116 TRACK. stiff enough to make a rigid connection when the switch is operated from theswitchstand in the usual way. If set for one track, and a train trails upon itfrom the other track., the wheel flanges will force the switch rails over by com-pressing the spring, so that the train is not derailed and the switch connectionsare not broken. This type of switch is now very little used, and the que
. Railway track and track work . , the con-necting rod from the switchstand is fastened to a strap surrounding a stiff spiralspring carried by the head rod. The rod passes through the spring, which is 116 TRACK. stiff enough to make a rigid connection when the switch is operated from theswitchstand in the usual way. If set for one track, and a train trails upon itfrom the other track., the wheel flanges will force the switch rails over by com-pressing the spring, so that the train is not derailed and the switch connectionsare not broken. This type of switch is now very little used, and the questionof allowing trains to trail through closed switches is discussed farther on, underthe head of Switchstands. Slip Switches.—These are used at the intersections of diagonal tracks, wherethere is no room for an ordinary switch and turnout. The curves are neces-sarily very sharp, but the switches work very effectively in practice, and arelargely used in yard work. A double slip switch is shown in Fig. 55. Such OOWN MAIN TRACK. ... CW% Fig. 55.—Slip Switches. switches are not often used for main-track connections, but at the GermantownJunction (Philadelphia) of the Philadelphia & Reading Ry., where the four-trackline diverges to form two double-track lines, there are slips 112 ft. long, havingNo. 15 frogs and 28-ft. switch rails, so as to give easy and safe passage for high-speed trains. Three-Throw Switches.—Tn some cases, two turnouts diverge at the samepoint, requiring a crotch frog in the middle of the track, where the lead railsintersect. When permissible, it is better to set one switch a little in advance ofthe other, thus keeping the switch rails distinct, though this arrangement throwsthe crotch frog off the center line of the main track. Switches with Continuous Main Rails.—With the ordinary split switch themain rail on the turnout side is broken or interrupted. The continuous railfollows the turnout, and the switch rail makes the connection with the main-liner
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