On November 1, 1918, as the Great War in Europe was entering its final hours, a five-car elevated train was heading for the Flatbush section of Brooklyn with hundreds of homeward-bound commuters aboard. As the train rumbled down a shor hill between Prospect Park and Ebbets Field in the very heart of Brooklyn, the unthinkable happened: the motorman lost control and the train left the tracks as it curved into a tunnel at the foot of the hill. The...