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The Southern Pacific's Pengra Pass rail route, connecting Portland, Oregon with San Francisco, California, was completed in 1926.〔(Brian Solomon, ''Southern Pacific Railroad''. MBI Publishing Company, 1999, p. 38. ISBN 978-0-7603-0614-7 )〕 Hauling the trains over the Cascade Mountains would be the answer to problems with huge amounts of curvature and very steep grades dictated by the old line down the Willamette Valley and over the Siskiyou Mountains. Nonetheless, a major helper operation is demanded by the 44 miles of constant grade—the longest anywhere on the former Southern Pacific system, including Donner Pass. The pass itself is 1.5 miles from Willamette Pass.〔http://www.fs.usda.gov/recarea/willamette/recreation/wintersports/recarea/?recid=4729&actid=91〕 The right-of-way is surrounded by waterfalls and streams running through a Douglas fir forest. At many locations, the train comes very close to the sides of the canyon. For hours before seeing them, one may hear the noise of multiple-unit diesel engines thundering up the canyon walls in their task to get the trains over the mountains; from the other direction, dynamic brakes are whining wildly. Along the way they will pass through 22 tunnels, several snowsheds and multiple bridges across canyon after canyon. ==See also== * Oregon Eastern Railway (SP predecessor) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pengra Pass rail route」の詳細全文を読む スポンサード リンク
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