The Sierra Leone Government Railway operated in Sierra Leone from 1897 to 1974. It was unusual in that it formed a national railway system constructed solely to a 2 ft 6 in narrow gauge, whereas in other countries, gauge of such a narrow width was usually confined to feeder railways.

2 ft 6 in gauge railways are narrow gauge railways with track gauge of 2 ft 6 in. This type of rail was promoted especially in the colonies of the British Empire during the second half of the nineteenth century by Thomas Hall and Everard Calthrop.