. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . :^ Mo. Fia. 219.—Bending Moments and Depkessions. Combination of Loads. from right to left) under the second driver =+, the effectof the first driver is —; the effect of the third driver is— ; that of the fourth driver is —; the effect of thepilot is zero and likewise the effect of the trailer. The net effectis that the combination of wheels develops a moment imderthe second driver of only 55% of
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . :^ Mo. Fia. 219.—Bending Moments and Depkessions. Combination of Loads. from right to left) under the second driver =+, the effectof the first driver is —; the effect of the third driver is— ; that of the fourth driver is —; the effect of thepilot is zero and likewise the effect of the trailer. The net effectis that the combination of wheels develops a moment imderthe second driver of only 55% of that due to the second driverif it acted alone. Similarly the depression of rail produced bya wheel is maximum under that wheel, but it develops an up-ward force which may reduce the depression under some otherwheel, although probably not the adjacent wheel. For example,calling the depression produced by the ;first driver = +, the 602 KAILROAD CONSTRUCTION. § 542. effect of the second driver is to cause a further depression underthe first driver equal to +; the third driver has an addedeffect of — ; the effect of the pilot truck is neghgible. Thenet effect is a
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