Category:Narrow gauge railways by size

0–9

• 20 in gauge railways (1 C)
• 21 in gauge railways (1 C)
• 1 ft 10 in gauge railways (2 P)
• 1 ft 10¾ in gauge railways (2 C)
• 1 ft 11½ in gauge railways (1 C, 1 P)
• 600 mm gauge railways (24 C, 26 P)
• 1 ft 11¾ in gauge railways (1 C, 1 P)
• 2 ft gauge railways (21 C, 4 P)
• 2 ft ½ in gauge railways (1 C)
• 2 ft 2 in gauge railways (1 C)
• 2 ft 3 in gauge railways (1 C, 1 P)
• 700 mm gauge railways (1 C)
• 2 ft 4 in gauge railways (1 C)
• 2 ft 4½ in gauge railways (1 C)
• 750 mm gauge railways (21 C, 7 P)
• 760 mm gauge railways (12 C, 2 P)
• 2 ft 6 in gauge railways (27 C, 4 P)
• 2 ft 6½ in gauge railways (1 P)
• 785 mm gauge railways (3 C)
• 800 mm gauge railways (5 C, 10 P)
• 820 mm gauge railways (1 C)
• 2 ft 8½ in gauge railways (1 C)
• 2 ft 9 in gauge railways (5 P)
• 850 mm gauge railways (1 C)
• 891 mm gauge railways (1 C)
• 900 mm gauge railways (11 C, 2 P)
• 3 ft gauge railways (20 C, 6 P)
• 925 mm gauge railways (1 C)
• 950 mm gauge railways (4 C, 1 P)
• 3 ft 2 in gauge railways (2 C)
• 985 mm gauge railways (1 P)
• Metre gauge railways (2 C, 4 P)
• 3 ft 4 in gauge railways (2 C)
• 1040 mm gauge railways (1 C)
• 1050 mm gauge railways (4 C, 3 P)
• 1055 mm gauge railways (1 C)
• 3 ft 6 in gauge railways (46 C, 5 P)
• 3 ft 7 in gauge railways (1 P)
• 1100 mm gauge railways (4 C)
• 3 ft 9 in gauge railways (1 C)
• 3 ft 9½ in gauge railways (1 C)
• 3 ft 10 in gauge railways (1 P)
• 1200 mm gauge railways (7 C, 3 P)
• 4 ft gauge railways (3 C, 1 P)
• 4 ft 1 in gauge railways (1 C, 1 P)
• 4 ft 2 in gauge railways (1 C, 1 P)
• 4 ft 3 in gauge railways (2 C)
• 1300 mm gauge railways (2 C)
• 4 ft 6 in gauge railways (2 C, 3 P)
• 4 ft 6½ in gauge railways (1 C, 1 P)
• 4 ft 7¾ in gauge railways (1 C)
• 1432 mm gauge railways (2 C)