The Ma and Pa Trail in Harford County, Maryland, follows the route of the former Ma and Pa Railroad as a multi-use rail trail built for relatively easy travel on a former rail corridor. As described here, it extends 6.25 miles in three separated sections: the Bel Air Trail, the Fallston Link, and the Forest Hill Trail, with plans to join them into a continuous 10-mile route and possibly expand farther. It serves both recreation and practical local travel, with bridges, tunnels, parking, and other amenities. The trail also became widely known after the 2023 killing of Rachel Morin and the 2024 arrest and indictment of Victor Martinez Hernandez.