. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . 279a. Slips. In a crowded yard the possible number oftrack movements from one track to another may be greatly in-creased and even multiplied by the adoption of ^slips/ suchas are illustrated in Fig. 159a, which shows a ^ single slip^and also a *double slip. In one case the crossing of two railsis accomplished by using fxed frogs/ although it should berealized that these frogs are different from an ordinary switchfrog. A comparison of the continuity of the running railsthrough
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . 279a. Slips. In a crowded yard the possible number oftrack movements from one track to another may be greatly in-creased and even multiplied by the adoption of ^slips/ suchas are illustrated in Fig. 159a, which shows a ^ single slip^and also a *double slip. In one case the crossing of two railsis accomplished by using fxed frogs/ although it should berealized that these frogs are different from an ordinary switchfrog. A comparison of the continuity of the running railsthrough these frogs and through ordinary frogs, such as areillustrated in Fig. 130, or Plate VIII, will show the the case of the double slip the frogs are movable. Eitherfixed or movable frogs may be used for either single or doubleslips. As shown in the figure, the levers are so connected thatthe several operations necessary to set the rails for any desiredtrain movement are accomplished by one motion. These slipscan be used for frog angles varying from No. G to No. 15. § 2790. SWITCHES AND CROSSINGS. 325. pTrt 1 /;Q/t CHAPTER XII. MISCELLANEOUS STRUCTURES BUILDINGS. WATER-STATIONS AND WATER-SUPPLY. 280. Location. The water-tank on the tender of a locomo-tive has a capacity of from 3000 to 7000 gallons—sometimes less,rarely very much more. The consumption of water is very vari-able, and will correspond very closely with the work done bythe engine. On a long down grade it is very small; on a rulinggrade going up it may amount to 150 gallons per mile in ex-ceptional cases, although 60 to 100 gallons would be a more usualfigure. A passenger locomotive can run 60 miles or moreon one tankful, but freight work requires a shorter intervalbetween water-stations. On roads of the smallest traffic,15 to 20 miles should be the maximum interval between stations;10 miles is a more common interval on heavy traffic-roads. Butthese intervals are varied according to circumstances.
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