English: Diagram of a gravity incline (railway), with labels, illustrating the use of switchbacks (zig-zags). Created by User:J. Johnson, following figure 311 of Arthur Mellen Wellington's The economic theory of the location of railways (Sixth edition John Wiley & Sons, New York: 1904. p. 945).
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2009-09-02 19:25 J. Johnson 183×169× (3427 bytes) Diagram of a gravity incline (railway), with labels. Created by J. Johnson, following figure 311 of Arthur Mellen Wellington's "The economic theory of the location of railways" (Sixth edition John Wiley & Sons, New York: 1904. p. 945).
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