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The only source named has a picture of the Central Valley station and no other information. The original writer of the wikipedia article obviously had access to more detailed sources which are not named. I added some information but did not come across the source for the grades and curvature. JoeBrennan ( talk) 22:14, 16 August 2015 (UTC) Found the source, the Railroad Age Gazette article added to the sources. JoeBrennan ( talk) 13:46, 17 August 2015 (UTC) reply