Parker Street Railroad Bed and Cow Lot is a historic site in Newburyport. It was once part of the Eastern Railroad, which connected Boston and Portland, Maine, in the 19th century. The railroad bed is now a linear park that offers scenic views of the Merrimack River and the surrounding marshes. The cow lot is a remnant of the agricultural past of the area, where farmers grazed their cattle and harvested hay. The site is listed on the National Register of Historic Places and is managed by the Newburyport Conservation Commission.