8 p.m. Update: Piringer reports that the situation is under control, with no injuries. Units are beginning to clear the scene.

6:59 p.m. Update: Piringer tweeted that the “bulk of fire knocked down.”

However, firefighters remain on the scene.

6:24 p.m. Update: Piringer says firefighters are making progress. The fire has not been extinguished, though.

6:10 p.m. Update: The engine fire remains contained, but it has proven to be a labor-intensive effort, Piringer said. There is heavy smoke and additional units are being summoned, he said. There are no injuries, he said.

Original post: D.C. emergency units responded Thursday afternoon to reports of an Amtrak train engine on fire at Union Station.

However, authorities said there were no injuries. An Amtrak official said smoke blowing from the scene was not affecting train travel, either.

However, D.C. Fire/EMS spokesman Pete Piringer said the emergency response might affect traffic on streets around Union Station.

Several units responded, including Fire/EMS, Special Operations, Foam and Hazardous Materials crews, Piringer said.

No flames were visible, but the engine was “smoking profusely,” he said, suggesting that hydraulic and electrical components may be on fire. Christina Leeds, a a spokeswoman for Amtrak, said the engine was not attached to any other equipment, and the cause of the fire was unknown.

The engine was towed to a different track, Piringer said, away from the train terminal and close to the H Street Bridge, where firefighters could conduct firefighting operations.

Piringer said no structures or individuals were in danger.