International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 535
t/.A 17° turnout curve g iii is next laid out to the left of themain track, with its P. C. located so as to bring the headblock g of the second switch far enough from the heel d ofthe first switch to afford sufficient room for operating thesecond switch. This calls for a No. 6 frog at k and a No.… … □MI TRACK WORK. 1123 They are, of course, needed only for sidings built withgrades descending towards the switch. An effective type of a derailing switch is shown at A inFig. 535. It consists of a single switch rail a, which ishinged at the rail joint d. The switch point c is beveled, asshown in…
Railroad engineering
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