BALTIMORE -- The Baltimore Orioles were forced to postpone Thursday's day-night doubleheader against the Texas Rangers because of a train derailment near Camden Yards.

The first game originally was scheduled to be played Wednesday night as part of a day-night doubleheader. It was postponed when heavy, black smoke billowed above Oriole Park 90 minutes before the start and was rescheduled as part of a day-night doubleheader Thursday.

Thursday's first game was postponed early in the day. Officials had hoped the teams would be able to play Thursday's night game, but it was later postponed because of the continuing clean-up of the affected area.

No date was immediately determined to make up the two games.

On Wednesay, the ballpark was evacuated after the train carrying hazardous materials derailed in a tunnel that runs about one mile north from the Camden Yards sports complex. The chemicals included hydrochloric acid, fire officials said. Two firefighters were hospitalized with chest pains.

Fans who attended Wednesday's first game, won by Texas 6-4, already had left the ballpark long before players and other ballpark employees were evacuated. The smell of the smoke reached the stadium bowl as the final stages of the evacuation were in progress.

Some stadium parking lots were blocked off by the fire department, leaving some workers and members of the media waiting to get out.

Later in the night, state highway officials closed all major roadways into the city.