mm	in		line
500	19.7		Santiago Quinta Normal el tw (CL); Yucatán mule lines (MX); human-powered tw in Beira (MZ)
600	23.6		Santiago La Pirámide el tw (CL); industrial rrs everywhere
610	24.0		Edaville rr (US)
660	26.0		Raposos-Nova Lima el tw (BR)
750	29.5		Cochabamba el tw (BO); Santiago Yungay el tw (CL)
762	30.0		Maracaibo (VE); Port-au-Prince (HT); Pusan (KR)
800	31.5		Santos an tw, Itatinga el tw (BR)
820	32.3		Rio de Janeiro Carris Urbanos an tw (BR)
900	35.4		Linz (AT); Braga, Lisboa (PT); Detroit tourist tw (US)
914	36.0		La Guaira (VE); Medellín, Pereira (CO); Pachuca, Real de Catorce (MX); Corregidor (PH); Singapore (SG); Sóller (ES); Lead SD, Seattle cable tw; Boston RB&L rr (US)
950	37.4		Roma suburban, Messina, Cagliari (IT)
1000	39.4		Bogotá (CO); Concordia (AR); La Paz (BO); Ponce (PR); San Luis Potosí (MX); many tws & most rrs in Brazil (BR); tws & rrs in many countries but not USA (US)
1050	41.3		Beirut (LB); Damascus (SY)
1055	41.5		Alger, Oran (DZ)
1067	42.0		Denver, Los Angeles, Portland, Tacoma, San Francisco cable (US); Arequipa (PE); Caracas (VE); Panama City (PA); Quito (EC); San José (CR); Colombo (LK); Hong Kong (CN); Seoul (KR); Arnhem (NL); Tallinn (EE); rrs in Japan (JP) & South Africa (ZA) ("Cape gauge")
1100	43.3		Rio de Janeiro Santa Teresa tw, Cantagalo rr (BR); Braunschweig, Kiel, Lübeck (DE); Varese (IT)
1188	46.8		Jakarta (ID)
1219	48.0		Canton, Honolulu, Laredo, Pueblo, San Antonio, Springfield (US); Glasgow metro (UK)
1350	53.1		Santos (BR)
1365	53.8		Bilbao (ES)
1372	54.0		Rio de Janeiro's São Cristóvão an tw (BR); São Luís an & st tw (BR) ; Hakodate, Tokyo, Yokohama (JP)
1416	55.8		tws in Glasgow area (UK)
1435	56.5		many tws (but not many rrs) in Latin America; all el tws in Argentina except Concordia; all el tws in Mexico except Pachuca, Real de Catorce and San Luis Potosí; most other tramways and railroads in the world not on this list ("standard gauge")
1473	58.0		St. Louis (US)
1495	58.8		Toronto tw & metro (CA)
1524	60.0		Camden, Jacksonville, Louisville, Quincy IL, Savannah (US); Panama rr (PA); most tws & rrs in former Soviet Union (SU)
1575	62.0		Columbus, Norfolk, Trenton, Philadelphia Railways (US)
1581	62.2		Philadelphia tws & Market St. (but not Broad St.) subway; Wilmington (US)
1587	62.5		Cincinnati, Key West, New Orleans, Wheeling, most Pennsylvania tws (US)
1600	63.0		Altoona (US); rrs & metros in Brazil (BR); rrs in Australia (AU) & Ireland (IE) ("Irish gauge")
1638	64.5		Baltimore (US)
1668	65.7		rrs in Portugal (PT) and Spain (ES)
1676	66.0		Bahía Blanca (AR); Fairfield ME, San Francisco BART (US); an tws in Santiago and Valparaíso (CL); rrs in Argentina (AR), Chile (CL) & India (IN) ("Indian gauge")
1680	66.1		Mauá-Fragoso rr (BR, 1854)
1829	72.0		early rrs in United States (US)