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The portal of Siskiyou line's Tunnel No. 1 at milepost 530.8, in the northern part of Cow Creek Canyon. The curve around it was built in the 1970s.


© Larry Tuttle, used with permission. Larry provides lots of information about the Siskiyou line on his own website. There are also more photos of Tunnel No. 1 at the original location of this photo.