At least 29 passengers were killed and about 75 were injured when the Nevsky Express train from Moscow to St. Petersburg derailed, an emergencies ministry source said Saturday. It was not immediately clear what caused the accident. Just prior to the accident, the train driver had applied the brakes. The last four cars out of thirteen were involved from train #166 at 18:34 GMT Moscow time. A mobile field hospital was being flown to the accident site, near Bologoye, 200 miles from Moscow, to render assistance to injured passengers. Ambulances, Federal Security Service officers, law enforcement, emergency services and railroad...