. Railroad construction. Theory and practice . Fig. 19. 33, ALIGNMENT. 33 also frequently used in locating new parallel tracks and modify-ing old tracks. a. To move the forward tangent parallel to itself a distance x,the point of curve (a) remaining fixed. (Fig. 20.) VV X sin h V F sin A The triangle BmB^ is isosceles and Bm^^Bm, Br rr E-B=.00=^7nB = vers BmB vers A (13) R=R-\- X vers J (14) The solution is very similar in case the tangent is moved in-ward to YB, Note that this method necessarily changes the. Fig. 20.

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