4:05 p.m. Update: The MTA says the Brunswick Line has reopened. Trains are operating at reduced speeds. Delays of 10 to 15 minutes west of Gaithersburg are likely, officials said.

3:55 p.m. Update: CSX spokesman Robert Sullivan said the freight train was traveling from Philadelphia to Connellsville, Pa., when it struck a person near Gaithersburg around 1:30 p.m. The train consisted of two locomotives and 90 empty freight cars. Sullivan said he doesn’t know how fast the train was going, however, it takes such a train a mile or more to come to a stop.

CSX, along with Maryland police officials, are still investigating the details of the incident, Sullivan said. It is unclear when service will resume on the line.

“We work very hard with authorities to prevent this” type of accident from occurring, Sullivan said. “Railroads are not places where people should be.”

CSX operates the Brunswick Line for Maryland on tracks that the freight rail company owns.

— Jennifer Buske

3:30 p.m. Update: The MTA says that the tracks may reopen within the hour. Trains 873 and 891 will advance to Rockville at their scheduled times and await the opening of the track, officials said.

3:15 p.m. Update: The MTA says there is no current estimate of the time delay. Trains 873 (scheduled to depart at 3:35 p.m.) and Train 891 (3:50 p.m.) will hold at Union Station, officials said.

The MTA is encouraging passengers to arrange alternate transportation. Some passenges should consider using Montgomery County’s Ride On bus service, especially passengers bound for Silver Spring, Kensington, Garrett Park, Rockville, Metropolitan Grove, Germantown, Washington Grove and Gaithersburg, the MTA said.

3:08 p.m. Update: The MTA said that the Metro option became available at 2:55 p.m. for Brunswick Line passengers. Efforts are underway to establish a bus bridge, a spokesman said.

3 p.m. Update: Post staffer Mark Berman reports that Metro is announcing in its stations that the Metro option is available for MARC riders on the Red Line.

We are checking with the MTA on what options are available for Brunswick Line passengers.

Original post: The Brunswick Line of the Maryland Area Regional Commuter service is closed due to a CSX train striking and killing a pedestrian near Gaithersburg, according to the Maryland Transit Administration.

MTA officials said they are trying to arrange alternate transportation for MARC passengers.

The Brunswick Line carries passengers between Washington and points north and west, including Frederick and Martinsburg, W.Va.