5:40 p.m. Update: MARC 855 on the Camden Line is holding outside of Camden Station due to freight congestion. Penn Line Train 426 is holding at New Carrollton awaiting emergency medical personnel, according to the Maryland Transit Administration.

Original post: A blocked track is delaying several Maryland Area Regional Commuter (MARC) trains at Union Station.

Trains 428, 846 and 853 are all reported late.