This list presents an overview of railway track gauges by size. A gauge is measured between the inner faces of the rails.

Track gauges by size

Model railways

Model railway gauges are covered in rail transport modelling scales.

Gauge Country NotesMetricImperial 3 mm 3 mm (0.118 in) Scale 1⁄40 in (0.635 mm) to 1 ft (305 mm). 2⁄75 in (0.677 mm) to 1 ft (305 mm). 2 mm to 1 m. Scale ratio 1:450 (Japanese 3 ft 6 in (1,067 mm) gauge). 1:480 (Standard gauge). 1:500 (Standard and broad gauge). Models at N, Z, Ze and T gauges. See T gaugeFinescale standardList of narrow-gauge model railway scalesModel military vehicleRail transport modellingRail transport modelling scales 4 mm 4 mm to 1 ft, Scale 4 mm to 1 ft (305 mm). Scale ratio 1:76.2. See EM gaugeFinescale standardProtofour4 mm scaleList of narrow-gauge model railway scalesModel military vehicleRail transport modellingRail transport modelling scales 6.50 mm 6.5 mm / 0.256 in Scale 1.385 mm to 1 ft (305 mm). Scale ratio 1:220. See Z scaleFinescale standardModel military vehicleRail transport modellingRail transport modelling scales H0f. Model gauge Model gauge 6.5 mm (0.256 in). Standard(s) NEM 010. Prototype gauge 600 mm (2 ft). Scale 3.5 mm to 1 ft (305 mm). Scale ratio 1:87. See H0f gaugeHOn2 guageFinescale standardModel military vehicleRail transport modellingRail transport modelling scales Model gauge 7.06 mm (0.278 in). Scale 1.385 mm to 1 ft (305 mm). Scale ratio 1:87.1. See H0f gaugeHOn2 guageFinescale standardModel military vehicleRail transport modellingRail transport modelling scales 7 mm Scale 7 mm per foot. Scale ratio 1:43.5. See 7 mm scale7mm Narrow Gauge AssociationScaleSevenFinescale standardProtofour4 mm scaleO14Model military vehicleRail transport modellingRail transport modelling scales British 0 gauge 32 mm (0 gauge) 4 ft in Prototype gauge, Standard Gauge ScaleSeven (standard) 33 mm 4 ft in ScaleSeven (Irish) 36.75 mm 5 ft 3 in Prototype broad gauges ScaleSeven (Great Western) 49.2 mm 7' 0¼" Great Western broad gauge Prototype broad gauges O21 21 mm 3' Prototype narrow gauges O16.5 16.5 mm (H0 gauge) 2' 4¼" 2' - 2'6" Prototype narrow gauges O14 14 mm 2' Prototype narrow gauges O9 9 mm (N gauge) " Prototype narrow gauges 7.06 mm HOn2. Model gauge 7.06 mm (0.278 in). Scale 3.5 mm to 1 foot. Scale ratio 1:87.1. See HOn2 guageH0f gaugeFinescale standardModel military vehicleRail transport modellingRail transport modelling scales 9 mm Scale ratio 1:148 (United Kingdom)Modelling British railway prototypesBritish N gauge 1:150 (Japan) 1:160 (elsewhere). See N scaleBritish N gaugeHOn30 gauge3 mm scale3 ft gauge rail modellingFinescale standardRail transport modellingRail transport modelling scales Model gauge 9 mm (0.354 in). Scale 4 mm to 1 ft (305 mm). Scale ratio 1:76. See OO9Finescale standardRail transport modellingRail transport modelling scales Model gauge 9 mm (0.354 in). Scale 3.5 mm to 1 ft (305 mm).Scale ratio 1:87. See H0eFinescale standardRail transport modellingRail transport modelling scales British N gauge. Model gauge 9 mm (0.354 in) Scale 2 1/16mm to 1 ft (305 mm). Scale ratio 1:148. See British N gaugeModelling British railway prototypesFinescale standardRail transport modellingRail transport modelling scales 9.42 mm 2 mm to 1 ft, Scale ratio 1:152.4. See 2 mm scaleFinescale standardRail transport modellingRail transport modelling scales 12 mm Scale 5.5 mm to 1ft. Scale ratio 1:55. 5.5 mm to 1 foot scale (1:55.4 or 1:55). See 5.5 mm scaleFinescale standardRail transport modellingRail transport modelling scales Scale 5.5 mm to 1ft. Scale ratio 1:55. 5.5 mm to 1 foot scale (1:55.4 or 1:55). See 00n3Finescale standardRail transport modellingRail transport modelling scales Scale 1⁄10 in (2.54 mm) to 1 ft (305 mm).Scale ratio 1:120 See TT scale3 mm scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 12 mm (0.472 in). HOn scale. Scale 3.5 mm to 1 ft (305 mm). Scale ratio 1:87. See HOn3½ gaugeFinescale standardRail transport modellingRail transport modelling scales H0m gauge. Model gauge 12 mm (0.472 in). Scale 3.5 mm to 1 ft (305 mm). Scale ratio 1:87. See H0m gaugeFinescale standardRail transport modellingRail transport modelling scales 12.7 mm 12.7 mm (0.5 in) Scale 6.35 mm to 1 foot. Scale ratio 1:48. See On2 gaugeFinescale standardRail transport modellingRail transport modelling scales 14 mm Scale 7 mm to 1 ft. Scale ratio 1:43.5. See O14Finescale standardRail transport modellingRail transport modelling scales 16.5 mm 3.5 mm Scale 3.5 mm to 1 ft (305 mm). Scale ratio 1:87 (world) 1:80 (Japan). in, 1:87 scale (3.5 mm to 1 foot). See HO scaleHOn30 gaugeFinescale standardRail transport modellingRail transport modelling scales See On30 gaugeFinescale standardRail transport modellingRail transport modelling scales 4 mm to 1 ft (00 scale 1:76), (3.5 mm to 1 foot), Model gauge 16.5 mm (0.65 in) 16.5 mm in. See OO gaugeFinescale standardRail transport modellingRail transport modelling scales Scale 3.5 mm to 1 foot. Scale ratio 1:87.1. See Proto:87Finescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Scale. 5.5 mm to 1ft. Scale ratio 1:55. 5.5 mm to 1 foot scale (1:55.4 or 1:55). See 5.5 mm scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Scale 4 mm to 1 ft. Scale ratio 1:76.2. See OO gauge or OO scale4 mm scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Scale 7 mm to 1 ft. Scale ratio 1:43.5. See O16.5Finescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Scale ratio 1:22.5 – 1:29. Typical models built are between 1:20.3 and 1:24, or up to 1:29. See Gn15Finescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Sn. Scale (4.8 mm) to 1 ft (305 mm). Scale ratio 1:64. See SnFinescale standardRail transport modellingRail transport modelling scales Model gauge 16.5 mm (0.65 in). Scale 4 mm to 1 ft (305 mm). Scale ratio 1:76.2. See 4 mm scaleFinescale standardRail transport modellingRail transport modelling scales 18.83 mm Scale 4 mm to 1 ft (305 mm). Scale ratio 1:76.2. See Protofour or P4Finescale standardRail transport modellingRail transport modelling scales 22.4 mm and 23 mm 22.4 mm 0.883 in Model gauge and 23.0 mm 0.905 Model gauge Scale inch to 1 foot. Scale ratio 1:64. See S scale or S gaugeFinescale standardRail transport modellingRail transport modelling scales 32 mm British: 7 mm to 1 ft (7 mm to 304.8 mm, 1:43.5); Continental Europe: 1:43.5 and 1:45; American: 1⁄4 in to 1 ft (6.35 mm to 304.8 mm, 1:48). See O scale or O gaugeFinescale standardRail transport modellingRail transport modelling scales Model gauge 32 mm (1.26 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7. See SE scaleFinescale standardRail transport modellingRail transport modelling scales in Model gauge 32 mm (1.26 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7 and 9 mm 1:34. See Finescale standardRail transport modellingRail transport modelling scales in Model gauge 32 mm (1.26 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7 and 1:20.3. See F scaleFn2Finescale standardRail transport modellingRail transport modelling scales in Model gauge 32 mm (1.26 in). Scale 16 mm to 1 foot. Scale ratio 1:19.05. 1:19. See 16 mm scale or SM32Finescale standardRail transport modellingRail transport modelling scales 45 mm G gauge Scale ratio 1:22.5 See G scale or G scale, G gauge, large scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 45 mm (1.772 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7. See SE scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 45 mm (1.772 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7. 1/2 1:24. See H scaleFinescale standardRail transport modellingRail transport modelling scales Model gauge 45 mm (1.772 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7. 1:20.3. See F scaleFn3Finescale standardRail transport modellingRail transport modelling scales Model gauge 45 mm (1.772 in). Scale 7⁄8 in to 1 ft. Scale ratio 1:13.7. 1:19. See 16 mm scale or SM45Finescale standardRail transport modellingRail transport modelling scales.

Minimum and ridable miniature railways

For ridable miniature railways and minimum-gauge railways, the gauges are overlapping. There are also some extreme narrow-gauge railways listed. See: Distinction between a ridable miniature railway and a minimum-gauge railway for clarification.

Model railway gauges are covered in rail transport modelling scales.

Gauge Country NotesMetricImperial 89 mm See in (89 mm) gauge ridable miniature railways. 121 mm See in (121 mm) gauge ridable miniature railways. 127 mm See gauge ridable miniature railways. 145 mm Denmark Brandhøjbanendk, at Hedeland veteran railwaydk, Hedeland, Hedehusene, Høje-Taastrup. Mixed gauge: , in (145 mm) and gauges are all in use on this model-miniature railway., there is also one at Denmark's railway museum in Odense, one at the Tramway Museum Skjoldenæsholm, Jystrup, Ringsted, and many other model-miniature railways in Denmark and Model lane Europe, Hadsten, Favrskov and many others. 184 mm See (184 mm) gauge ridable miniature railways. See gauge ridable miniature railways. 210 mm See in (210 mm) gauge ridable miniature railways. 229 mm See 9 in (229 mm) gauge ridable miniature railways. England Railway built by minimum-gauge pioneer Sir Arthur Heywood, later abandoned in favor of gauge. 240 mm See  in (240 mm) gauge ridable miniature railways. 241 mm See in (241 mm) gauge ridable miniature railways. 260 mm See in (260 mm) gauge ridable miniature railways. 267 mm England Beale Park miniature railway 305 mm See 12 in (305 mm) gauge ridable miniature railways. 311 mm Wales Fairbourne Railway 340 mm Netherlands Ridable miniature railway in DierenPark Amersfoort 350 mm Netherlands Collection Decauville Spoorweg Museum 356 mm United States See 14 in (356 mm) gauge ridable miniature railways and Chicago Tunnel Company (during construction process). 368 mm United States John J. Coit's Seaside Park Miniature Railway and Long Beach and Asbury Park Railway 381 mm 381 mm (15 in): Known as the "minimum gauge", this was used for several private estate railways and garden railways that were larger than hobby models but smaller than industrial lines. Experimental & Miniature Gauges, 381 mm (15 in): Known as the "minimum gauge", this was used for several private estate railways and garden railways that were larger than hobby models but smaller than industrial lines. See 15 in gauge railways. 400 mm France Agricultural field railways (Decauville portable track) 406 mm United States See 16 in (406 mm) gauge ridable miniature railways. 419 mm Canada See in (419 mm) gauge ridable miniature railway. England Berkhamsted Gasworks Railway 432 mm England Long Rake Spar mine, underground mine railway 450 mm Czech RepublicIndustrial railwaysTrack gauge by size From Czech wikiEnglandLittlethorpe Potteries, hand-worked line connecting clay pits to pottery 457 mm AustraliaNational Railway Museum, Port AdelaideEnglandCrewe Works Railway, Horwich Works Railway, Royal Arsenal Railway, Sand Hutton Light Railway, Steeple Grange Light RailwayUnited StatesEastlake Park Scenic Railway, Venice Miniature Railway and Billy Jones Wildcat Railroad 470 mm United StatesTravel Town Museum miniature railway 483 mm Isle of ManGreat Laxey Mine RailwayUnited StatesSwanton Pacific Railroad EnglandAyle Colliery mine railway, Athole G. Allen Ltd. Closehouse Barytes Mine railway

Narrow gauge

Railways with a track gauge between and .