GIRR Interchange
The Geologically Improbable Railroad, Mountain
Division
The Interchange
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The interchange is a collection of
TEN turnouts controlled by the route control system in the
main panel. Seven of them can be seen in the photo. It is basically
a scissors crossover between the inner and outer lines. A passing
siding and a branch to the upper line are integrated into the
interchange such that a train can pass between any two lines
without fouling the third line. The route control system sets all
10 turnouts correctly depending on which of 6 routes are selected
and also establishes correct power routing through the interchange.
The passing siding also allows cars to be left at the bottom of the
spiral while doubling the grade, a common requirement since the
spiral is 5.2%.
© 1997 George Schreyer
Last Updated Nov 5, 1999
