Monocacy is a passenger rail station on the MARC Brunswick Line between Washington, D.C. and Frederick, MD. This station is 1 of 2 stations on the Frederick extension. It is also the only station on the Brunswick Line to have a high-level platform (except for Union Station). There is also a low level platform at the north end of the station. Monocacy Station is located at 7800 Genstar Drive, a cul-de-sac with a large parking lot off the east side of Maryland Route 355 in Frederick, Maryland.