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The original Siskiyou Line of 1880 was located in the middle between today's Interstate 5, and the detour to the Black Butte siding. If steeper grade is accepted for passenger rail, it could be routed along I-5.
(Curve radius is put down in meters on this map.)

The underlying map is found on
© Maps a la carte, Inc, used with permission.
The following link gives an overview over the whole speed zone, from Black Butte to Edgewood.. Navigation, magnification and resizing needs Javascript on that site.

Last modified: 2003-08-04