. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . t at each end so as to reduce the amount of drilling necessary to reach a car which may be at the extreme end of a longstring of cars. This is done usually by means of two laddertracks, parallel to each other, which thus make the storagetracks between them of equal length. 6. The equality of length of these storage tracks is a point in-sisted on by many, but on the other hand, trains are not always ofuniform length even on any one division. Loaded trains andtrains of empties T
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . t at each end so as to reduce the amount of drilling necessary to reach a car which may be at the extreme end of a longstring of cars. This is done usually by means of two laddertracks, parallel to each other, which thus make the storagetracks between them of equal length. 6. The equality of length of these storage tracks is a point in-sisted on by many, but on the other hand, trains are not always ofuniform length even on any one division. Loaded trains andtrains of empties Tvdll vary greatly in length, and the variousstyles and weights of freight engines employed necessitate othervariations in the weights and lengths of trains hauled. Withstorage tracks of somewhat variable length a larger percentageof track length may be utilized, there will be less hauHng over auseless length of track, and (assuming that the plot of groundavailable for yard purposes has equally favorable conditions foryard design) more business may be handled in a yard of givenarea. ? 295. YARDS AND TERMINALS. 343. >^ ^; o QQ I 344 RAILROAD CONSTRUCTION. § 295. 7 Yards are preferably built so that the tracks have a gradeof —sometimes a little more than this—in the direction ofthe traffic through the yard. This grade, which will overcome atractive resistance of 10 pounds per ton, will permit cars to bestarted down the ladder tracks by a mere push from the switch-ing engine. They are then switched on to the desired storagetrack and run down that track by gravity until stopped at thedesired place by a brakeman riding on the cars 8. Although not absolutely necessar}% there is an advantagein having all frog numbers and switch dimensions 7 frogs are most commonly used. Sharper-angled frogsmake easier riding, less resistance and less chance of derailment,but on the other hand require longer leads and more space. and even No. 5 frogs are sometimes used on ac
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