. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . rail. In order to retain in it as much strength as possible, the point-rail is raised so that it rests on the baseof the stock-rail, one side of the base ofthe point-rail being nearly cut may be seen in Fig. 137, althoughthe influence of the point of the rail inmoving the wheelrflange away from thestock-rail is really zero at that point,yet the rail has all the strength of theweb, more than one-half that of thebase, and is also reinforced. The planingruns back in straig
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . rail. In order to retain in it as much strength as possible, the point-rail is raised so that it rests on the baseof the stock-rail, one side of the base ofthe point-rail being nearly cut may be seen in Fig. 137, althoughthe influence of the point of the rail inmoving the wheelrflange away from thestock-rail is really zero at that point,yet the rail has all the strength of theweb, more than one-half that of thebase, and is also reinforced. The planingruns back in straight lines, until at aboutsix or seven feet back from the pointthe full width of the head is obtained. The full width ofthe base will only be obtained at about 13 feet from thepoint. The A. R. E. A. standard switch rail is always cut onthe basis that the distance between gauge lines at the heel of[ the switch (the distance MN in Fig. 143) is 6i inches and thatI the point is i inch wide. Then, using four standard1 lengths, 11, 16|, 22 and 33 feet, the angles vary from 2° 36 191 to 0° 52 05, as shown in Table Fig. 137. 301. Switch-stands. The simplest and cheapest form is the^ ground lever, which has no target. The radius of the circledescribed by the connecting-rod pin is precisely one-half thethrow. From the nature of the motion the device is practically 340 RAILROAD CONSTRUCTION, §301, self-locking in either position, padlocks being only u^ed to pre-vent malicious tampering. -cfi^ ^ ft nia m Hi llllll U| N ]-< )m
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