SILVER SPRING, Md. (AP) _ An Amtrak passenger train and a Maryland Rail Commuter train collided just north of the nation's capital during a heavy snowstorm Friday afternoon. Six people were killed and at least three dozen injured, officials said.

Six people were found trapped in a train car and died from multiple trauma and fire, said Denise Fox, a spokeswoman for the Montgomery County Fire Department. She said two victims were taken to Suburban Hospital with serious trauma injuries.

Amtrak's Capital Limited train carrying 175 passengers and crew on a run between Washington, D.C., and Chicago, collided with the MARC train about 5:45 p.m. in Silver Spring, Md., said Courtney McPhee, a Montgomery County, Md., police spokeswoman.

The Capitol Limited comprised two locomotives, seven baggage cars, two passenger coaches, two lounge cars and two sleeping cars.

The locomotives and four baggage cards derailed. All Amtrak passenger cars were believed to have stayed upright on the tracks, Amtrak said. One locomotive was on fire after the crash. Other cars were jackknifed on the rails.

The MARC train was bound for Washington.

Bill Gatchel, a passenger on the Amtrak train, told a television interviewer he was playing solitaire in the lounge car ``and all at once, a big crash happened. We jerked, and that's all I can really tell you.''

``When I got off the train, I saw one engine off the track,'' Gatchel said. ``I saw smoke rising that looked like it was from another engine, I'm not sure.

Warren Monks, a spokesman for the Maryland Transit Administration, said information from the scene was sketchy and it was unclear what caused the wreck. But he said: ``We were having some switch problems.''

``I heard a big boom it sounded like a bomb,'' said Barbara Freeman, 39, who lives in a first floor apartment in a building next to the track. ``We looked out the living room window, and all we were seeing was smoke and a big ball of fire.''

A Montgomery County Fire Department official who spoke on condition of anonymity said at least three dozen people were injured. Some of the more seriously injured were still on the train shortly before 7 p.m. EDT