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If you're wondering why they would go all the effort to bring a water car, I talked to the to one of the conductors and apparently the quality of the water in the Fremont/Niles area is extremely poor and the chemicals they put in the water to turn the frogs gay also has a tendency to clog the values in locomotives, so they filled the tanker with water from up in Sunol and brought it down to act as an impromptu tender.
