"An interesting part of the Santa Fe construction through the gorge is the hanging bridge at a point where the gorge narrows to 30 feet. Here the railroad had to be suspended over the river along the north side of the gorge as shear rock walls go right down into the river on both sides. C. Shallor Smith, a Kansas engineer, designed a 175-ft plate girder suspended on one side by "A" frame girders spanning the river and anchored to the rock walls. The bridge cost $11,759 in 1879, a princely sum in those days. Although it has been strengthened over the years, this unique structure has served on a main rail line for over 118 years." ( http://www.royalgorgereservations.com/about.aspx )

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