The collection consists of passenger and freight equipment, as well as artifacts from the 2 ft (610 mm) narrow gauge railways that ran in the state of Maine in the late 19th century and early 20th century.

[1] The organization operates a 1+1⁄2-mile (2.4 km) long railroad that runs along the waterfront of Casco Bay and parallels Portland's Eastern Promenade.

Historic steam and diesel locomotives and a variety of restored coaches are used to run passenger services on the railroad.

[1] Since 2021, Several of their steam locomotive equipment are currently on long-term loan at the Wiscasset, Waterville and Farmington Railway.

[2][3] In mid-January 2025, the railroad was shut down for several months as tracks were ripped up for "Portland Foreside", a $660M luxury neighborhood development project, featuring a hotel, restaurant, condos, apartments, as well as an indoor market and public plazas.