Soaring temperatures caused a Bay Area Rapid Transit (BART) train to partially derail after the heat warped the track, the transit agency said.Temperatures at the Concord Airport, near the spot of the derailment, spiked to 102 degrees Fahrenheit (39C) last Tuesday — a record daily high. The train derailed during the evening commute that day.While the tracks are normally around 115F (46C), the heat pushed the them up to around 140F (60C), a BART spokesperson told the San Francisco Chronicle.Two cars partially derailed, and 50 people were evacuated from the train, BART said. One person went to the hospital...