• Narrow-gauge steam locomotives(7 C, 4 P)

0–9

• 600 mm gauge railway locomotives(1 C, 21 P)
• 2 ft gauge locomotives(49 P)
• 750 mm gauge locomotives(28 P)
• 760 mm gauge locomotives(4 P)
• 2 ft 6 in gauge locomotives(19 P)
• 785 mm gauge locomotives(4 P)
• 900 mm gauge locomotives(7 P)
• 3 ft gauge locomotives(1 C, 48 P)
• 3 ft 6 in gauge locomotives(7 C, 44 P)

H

• Hunslet narrow-gauge locomotives(12 P)

K

• Narrow-gauge diesel locomotives of Korea(1 P)

U

• Narrow-gauge locomotives of the United Kingdom(1 C, 49 P)

C

• China Railways DFH21
• Class 99 (German narrow gauge locomotives)

D

• Rio Grande class C-19

E

• EMD BB40T-2
• EMD G8
• EMD SD70ACe-BB

F

• Fire Queen
• FS class R.301

I

• Isle of Man Railway locomotives

L

• List of Ffestiniog Railway rolling stock
• List of Hunslet narrow-gauge locomotive designs

P

• Polar Bear (battery-electric locomotive)
• List of preserved Hunslet narrow-gauge locomotives

S

• Salamanca (locomotive)
• Stourbridge Lion

T

• Ty 9785