PlTTBBüBG, Pa., Aug. 38.- At 9 o'clock Tuesday morning motor No. 4, with one passenger car attactaed, descending Mount Oliver, on the St. Clair Electric road, became uncontrollable and started down the heavy grade at terrino speed. At the sharp curve near Fine street the motor and car jumped the rails, turning over several times before it stopped against a telegraph pole. The motor was smashed to pieces and the car badly wrecked. Engineer John McGibboney and Conductor Smythe jumped f rom the runaway train, escaping with painf ui injuries. Mrs. Rachel Herrón was the most seriously injured. 8he was badly cut about the head and gustained internal Injuries tbat it is foared will prove fatal. Tbe wife of Alderman Heinrich was very seriously hurt about the head. Mrs. Elizabeth Stewart and daughter were terribly cut and bruised, but will recover. Charles Morgan jumped from the car window, receiving numerous bruises. That any of the occupants of the car escaped with their Uves is considered miraculous. The cause of the accident is attributed to insufficient electric current. The motor was the property of the Daf t Electric company, of New York, and had not yet been taken off their hands by the St. Clair company.