The Portland–Lewiston Interurban (PLI) was an electric railroad subsidiary of the Androscoggin Electric Company operating from 1914 to 1933 between Monument Square in Portland and Union Square in Lewiston, Maine. Hourly service was offered over the 40-mile (64 km) route between the two cities. Express trains stopping only at West Falmouth, Gray, New Gloucester, Upper Gloucester and Danville made the trip in 80 minutes, while trains making other local stops upon request required 20 minutes more. The line was considered the finest interurban railroad in the state of Maine.

Falmouth is a town in Cumberland County, Maine, United States. The population was 12,444 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area.