This report assesses opportunities for expanding Lowell National Historical Park's historic trolley line by implementing a light rail system reminiscent of late 19th/early 20th Century trolley lines. This is in line with the Park Service's Transportation Mission to preserve and protect resources while providing safe and enjoyable access within the National Parks by using sustainable, appropriate, integrated transportation solutions. This Plan uses as a starting point the existing trolley system, the Park Service and the LNHP commitment to Alternative Transportation Systems (ATS), and the on-going efforts to revitalize the City of Lowell. Objectives relate to mobility for visitors and residents, reducing traffic congestion, intra-regional connectivity, economic development, and maintaining and interpretive and educational context. Four major routes are identified and options for these routes evaluated, using the Objectives and Route Selection Criteria.