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I saw train 668 leaving Belen on October 30, 1977 and chased it to the Rio Puerco bridge. Rio Puerco means dusty river in Spanish. Double track opened between Rio Puerco to Suwanee (about 15 miles to the northwest) on June 30, 1911. The new alignment swung further west and was over a mile longer than the original mainline. The original mainline, now the north track and used for many years as the eastbound main, descends on a 1.0% grade. The new line was built on a 0.6% grade and splits from the original line just west of Rio Puerco. Double track opened between Dalies and Rio Puerco in 1923. The highway from Los Lunas to Rio Puerco and on up to Suwanee was US 66 until 1937 when the new highway west of Albuquerque was opened. Rio Puerco is at milepost 34 at an elevation of 5,025 feet. For nearly the next 100 miles the railroad will be climbing a 0.6% grade up to the Continental Divide. Picture above is on disk 63.
An eastbound train comes through Rio Puerco on February 20, 1974.