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In order to achieve a short bridge length over Shasta River, Southern Pacific has opted for a curve radius, that causes a speed restriction to 52 mph at least. In direct contact to a bridge with direct fixation of the track, it might not be possible to use high superelevation and high unbalanced superelevation, forcing an even lower limit.

© Robert Morris Photography, used with permission. For railroad photography in the Dunsmuir region, this site offers a huge selection. The photo above can be viewed here in its original context.

Unit conversion for text on this page.
52 mph 84 km/h

Last modified: 2003-10-14