East Tennessee and Western North Carolina Railroad

The East Tennessee & Western North Carolina Railroad (reporting mark ET&WNC), affectionately called the "Tweetsie" as a verbal acronym of its initials (ET&WNC) but also in reference to the sound of its steam whistles, was a primarily 3 ft (914 mm) narrow gauge railroad established in 1866 for the purpose of serving the mines at Cranberry, North Carolina. The 3 ft (914 mm) narrow gauge portion of the ET&WNC was abandoned in 1950.

Source: Wikipedia — East Tennessee and Western North Carolina Railroad (CC BY-SA 4.0)