Frederick County (MD) got about 6 inches of rain in 2 hours last night. It was pretty nuts. Lots of flash flooding and swift water rescues all evening. MARC Train 879 got caught in a flash flood just south of Brunswick. The water was coming up so fast and so high, the riders had to take shelter on the upper level of the multi-level cars. And where they remained trapped for several hours. Fire Rescue was there, but determined it was safer to stay on the train and wait for the water to recede than evacuate the train by boat in the dark during a storm. The MARC Brunswick Line service is suspended today, and presumably the entire metropolitan sub is closed due to damage from the flooding.