7 1/4"
7 1/2"

Live steamers in U.S. Becoming very popular

15"

This is generally used at amusement parks

18"

Used in mining railroads

20"

Used in mining railroads

24"

Used in mining railroads and logging railroads - Maine, Wales,
S. Africa, Asia, and South America

30"

Used in mining railroads

36"

This is a common narrow gauge in the U.S.

1 Meter

Former French, German & British colonies

42"

Newfoundland, South Africa, Indonesia, New Zealand, and Nigeria

48 1/4"

-

56 1/4"

Washington D.C. Metro rapid transit

56 1/2"

Standard gauge in U.S. and many other countries. Established by Pacific RR Act of 1863

58"

-

60"

Russia & satellite nations and Panama Canal RR

62 1/4"

-

62 1/2"

-

63"

Australia, Brazil & Ireland

64 1/2"

-

66"

Used by BART (Bay Area Rapid Transit) in San Francisco, CA

72"

Erie RR - converted to standard in 1882