แนร์โรว์เกจ หรือ รางแคบ เป็นขนาดความกว้างรางรถไฟซึ่งมีขนาดแคบกว่าสแตนดาร์ดเกจ มีความกว้างประมาณ 610 mm (2 ft) ถึง 1,067 mm (3 ft 6 in)
- "Trade House" Kambarka Engineering Works "
- P.J.G. Ransom. Narrow Gauge Steam – Its origins and worldwide development, Oxford Publishing Co., 1996, ISBN 0-86093-533-7
- P. Whitehouse, J. Snell. Narrow Gauge Railways of the British Isles, David & Charles, 1994, ISBN C-7153-0196-9
- Railroads of Colorado: Your Guide to Colorado's Historic Trains and Railway Sites, Claude Wiatrowski, Voyageur Press, 2002, hardcover, 160 pages, ISBN 0-89658-591-3
- Keith Chester. "East European Narrow Gauge" 1995
- "Narrow Gauge Through the Bush – Ontario's Toronto Grey and Bruce and Toronto and Nipissing Railways"; Rod Clarke; pub. Beaumont and Clarke, with the Credit Valley Railway Company, Streetsville, Ontario, 2007. ISBN 978-0-9784406-0-2
- "The Narrow Gauge For Us – The Story of the Toronto and Nipissing Railway"; Charles Cooper; pub. The Boston Mills Press; Erin, Ontario, 1982.
- "Narrow Gauge Railways of Canada"; Omer Lavallee; pub. Railfair, Montreal, 1972.
- "Narrow Gauge Railways of Canada"; Omer Lavallee, expanded and revised by Ronald S Ritchie; pub. Fitzhenry and Whiteside, Markham, Ontario, 2005.
- "The Toronto Grey and Bruce Railway 1863–1884; Thomas F McIlwraith; pub. Upper Canada Railway Society, Toronto, 1963.
- "Steam Trains to the Bruce"; Ralph Beaumont; pub. The Boston Mills Press; Cheltenham, Ontario, 1977
- "Running Late on the Bruce"; Ralph Beaumont & James Filby; pub The Boston Mills Press, Cheltenham, Ontario, 1980
- Nevada Central Narrow Gauge เก็บถาวร 2014-01-11 ที่ เวย์แบ็กแมชชีน; Michael J. Brown
