| Metric (mm) | Imper. | Where | First |
|---|
| 260 | 10¼" | Audley End, Knebworth, Paignton Zoo, Vanstone, Wells | possibly 1970s, 2002-10-05 |
| 381 | 15" | R&ER, RH&DR, BVR, Lappa Valley, Praterbahn | 1979/1980, 1989-06-22 |
| 457 | 18" | Bicton, Steeple Grange, NRM (Port Adelaide) | 2002-07-20 |
| 597 | 1' 11½" | Festiniog, Launceston | 1990-06-22 |
| 600 | | Germany, Poland | 2012-10-06 |
| 610 | 2' | Mail Rail, Kew Bridge, Hythe Pier, Leighton Buzzard, Llechwedd (tramway), Statfold Barn, Groudle Glen | 1993-08-08 |
| 620 | | Postojna | 2010-06-22 |
| 686 | 2'3" | Talyllyn | 2005-05-21 |
| 750 | | Lithuania, Poland, Switzerland (Waldenburger Bahn) | 2013-05-21 |
| 760 | | former Austria-Hungary | 2002-08-18 |
| 762 | 2'6" | Sittingbourne, Statfold Barn, Welshpool & Llanfair, Puffing Billy | 1998-08-02 |
| 785 | | Poland | 2003-08-10 |
| 800 | 2'7½" | Snowdon, Switzerland | 1989-09-14 |
| 826 | 2'8½" | Volk's Electric Railway | 2018-09-16 |
| 838 | 2'9" | Seaton | 2003-07-07 |
| 864 | 2'10" | Funiculaire de Vieux Québec | 2012-05-05 |
| 891 | | Sweden | |
| 900 | | Linz, Lisbon, Molli | 1997-05-21 |
| 914 | 3' | Southend Pier, Llechwedd (funicular), Isle of Man, Ireland, Sollér, White Pass & Yukon | 1993-08-06 |
| 950 | | Italy, Eritrea | 2014-10-12 |
| 1,000 | | | 1989-09-14 |
| 1,009 | | Sofia | 2018-10-06 |
| 1,067 | 3'6" | Snaefell, southern Africa, Queensland, Western Australia, Tasmania, New Zealand, San Francisco | 1993-08-07 |
| 1,100 | | Braunschweig | |
| 1,118 | 3'8" | Bridgnorth | 1991-06-15 |
| 1,143 | 3'9" | Lynton | unknown |
| 1,200 | | Barcelona, Fribourg, Zagreb (funiculars) | 1996-04-22 |
| 1,220 | 4' | Glasgow Underground | 1991-10-22 |
| 1,283 | 4'2½" | Saltburn (funicular) | |
| 1,300 | | Lyon (Fourvière funicular) | 1989-09-08 |
| 1,372 | 4'6" | Southend Cliff Lift | 2017-07-15 |
| 1,422 | 4'8" | Mt. Washington Cog Railway | |
| 1,435 | 4'8½" | | unknown |
| 1,440 | | Paris (Montmartre funicular: first) | 1980-05-25 |
| 1,445 | | Madrid, Galati (RO) | 1997-05-17 |
| 1,450 | | Dresden | 2014-09-12 |
| 1,458 | | Leipzig | 2009-08-29 |
| 1,473 | 4'10" | Aberystwyth (funicular) | |
| 1,495 | 4'10⅞" | Toronto | 2012-05-06 |
| 1,520-1,524 | 5' | Hastings, fomer Soviet Union, Finland, Mongolia | 2004-11-13 |
| 1,581 | 5'2¼" | Philadelphia | 2012-05-13 |
| 1,588 | 5'2½" | Pittsburgh, New Orleans | |
| 1,600 | 5'3" | Ireland, Victoria, South Australia | 1994-08-20 |
| 1,668 | | Spain, Portugal | 1996-04-21 |
| 1,676 | 5'6" | BART, India, Argentina, Chile | 1996-08-17 |
| 1,800 | | Oberweissbach | 2009-08-27 |
| 1,829 | 6' | Hastings | 2004-11-13 |
| 1,980 | (6'6") | İstanbul (Tünel funicular) | 2012-04-07 |
| 2,000 | | Cairngorm Mountain | |
| 2,140 | 7'¼" | (GWR broad) Didcot | |
| 3,150 | | Trümmelbachfälle | 2023-07-04 |