Category:Narrow gauge railroads in the United States

• Narrow gauge railroads in the United States by state or territory (39 C)

+

• Narrow gauge railroads in Puerto Rico (6 P)

0–9

• 15 in gauge railways in the United States (8 P)
• 18 in gauge railways in the United States (5 P)
• 19 in gauge railways in the United States (2 P)
• 2 ft 6 in gauge railways in the United States (1 C, 12 P)
• 2 ft gauge railways in the United States (38 P)
• 3 ft 2 in gauge railways in the United States (3 P)
• 3 ft gauge railways in the United States (1 C, 258 P)
• 4 ft 3 in gauge railways in the United States (2 P)
• 3 ft 4 in gauge railways in the United States (4 P)
• 3 ft 6 in gauge railways in the United States (1 C, 14 P)
• 3 ft 9½ in gauge railways in the United States (1 P)
• 4 ft 8 in gauge railways in the United States (15 P)