Keywords: Gravity Incline.png en wikipedia 2011 December 18 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 Transferred from http //en wikipedia org en wikipedia; transferred to Commons by User Jay8g using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper 2009-09-02 Original uploader was J Johnson at http //en wikipedia org en wikipedia Released into the public domain by the author en wikipedia J Johnson Original upload log page en wikipedia Gravity_Incline png 2009-09-02 19 25 J Johnson 183×169× 3427 bytes <nowiki>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 </nowiki> Rail transport diagrams |