A senior citizen from Florida disappeared Wednesday while en route to the peak of Mount Washington, authorities say. William Davis, 79, was last seen taking a train on the Mount Washington Cog Railway, which ascends the New Hampshire mountainside. Davis, a native of Jacksonville, was spotted on the train’s observation deck around 3:20 p.m. on Wednesday. Around 6 p.m., park officials notified New Hampshire Fish and Game that Jackson was missing and said they believed he had wandered off the summit. The train ride up the mountain is approximately an hour long, and passengers typically disembark to explore for another hour before taking another train down. A park employee spoke with Davis on the phone…..