Three foot six inch gauge railways in the United States

A list of 3 ft 6 in (1,067 mm) gauge railways in the United States. Apart from historical railways, it is commonly used in underground coal mines. Also, in the past, this gauge had been a popular choice for urban mass transit systems (see table below).

Three foot six inch gauge railways in the United States

A list of 3 ft 6 in (1,067 mm) gauge railways in the United States. Apart from historical railways, it is commonly used in underground coal mines. Also, in the past, this gauge had been a popular choice for urban mass transit systems (see table below).