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Philadelphia Division: Middle Division: Pittsburgh Division: |
Helix ThreeThe main line then passes out of sight and enters a helix for the long trip downwards to West End Staging. As it passes the middle level, it picks up the Enola Yard leads and the Sunbury Branch as a fifth, outer track. The helix descends 4" per turn, with a 22.5" radius on the innermost track. Tracks are centered 1.5" apart. |
Copyright 1996 - 2008
Last modified: November 25 2007.
Keystone Crossings has served 4900307 pages since June 1, 1997.