Just south of Spruce, southbounds drop into what is known as "the sag". This is so named because trains briefly descend down a 1% grade. This is the former location of a crossover when Rio Grande and Santa Fe each had their own tracks. When the crossover were removed and the lines connected (to operate as the Joint Line), the southbound Santa Fe track descended down the embankment to connect with the Rio Grande track below.
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