In the late 19th century, Maine was home to several narrow-gauge railways, operating on rails 2 feet apart. Most of these trains have disappeared, but this nonprofit organization is dedicated to preserving the examples that remain. There’s a small fee for admission to the museum only, while a more expensive ticket also includes a short ride on the little train that putters along Casco Bay at the foot of the Eastern Promenade. Views of the islands are attractive; the ride itself is slow, but your kids will undoubtedly enjoy it.