An illustration of 2 ft 3 in (686 mm) track, in comparison with some other gauges used in Great Britain
Track gauge
By transport mode
Tram
Rapid transit
Miniature
Scale model
By size (list)
Minimum
Minimum
Fifteen inch
381 mm
(15 in)
Narrow
600 mm
Two foot
Two foot three inch
600 mm
610 mm
686 mm
(1 ft 11+5⁄8 in)
(2 ft)
(2 ft 3 in)
750 mm
Bosnian gauge
Two foot six inch
750 mm
760 mm
762 mm
(2 ft 5+1⁄2 in)
(2 ft 5+15⁄16 in)
(2 ft 6 in)
Swedish three foot
900 mm
Three foot
Italian metre
891 mm
900 mm
914 mm
950 mm
(2 ft 11+3⁄32 in)
(2 ft 11+7⁄16 in)
(3 ft)
(3 ft1+13⁄32 in)
Metre
1,000 mm
(3 ft 3+3⁄8 in)
Three foot six inch
1,067 mm
(3 ft 6 in)
Four foot
1,219 mm
(4 ft)
Four foot six inch
1,372 mm
(4 ft 6 in)
1432 mm
1,432 mm
(4 ft 8+3⁄8 in)
Standard
1,435 mm
(4 ft 8+1⁄2 in)
Broad
Italian broad gauge
Dresden gauge
1,445 mm
1,450 mm
(4 ft 8+7⁄8 in)
(4 ft 9+3⁄32 in)
Leipzig gauge
1,458 mm
(4 ft 9+13⁄32 in)
Toronto gauge
1,495 mm
(4 ft 10+7⁄8 in)
1520 mm
Five foot
1,520 mm
1,524 mm
(4 ft 11+27⁄32 in)
(5 ft)
Pennsylvania gauge
Pennsylvania gauge
Five foot three inch
1,581 mm
1,588 mm
1,600 mm
(5 ft 2+1⁄4 in)
(5 ft 2+1⁄2 in)
(5 ft 3 in)
Baltimore gauge
1,638 mm
(5 ft 4+1⁄2 in)
Iberian gauge
Five foot six inch
1,668 mm
1,676 mm
(5 ft 5+21⁄32 in)
(5 ft 6 in)
Six foot
1,829 mm
(6 ft)
Brunel
2,140 mm
(7 ft 1⁄4 in)
Breitspurbahn
3,000 mm
(9 ft 101⁄8 in)
Change of gauge
Break-of-gauge
Dual gauge
Conversion
list
Bogie exchange
Variable gauge
By location
North America
South America
Europe
Australia
In railway terminology, track gauge indicates the distance between the inside edges of the running rails. Standard gauge is defined as 1,435 mm (4 ft 8+1⁄2 in), and narrow gauge as any gauge less than that distance.
In Britain, standard gauge is used for all main line routes and the majority of urban light rail. Narrow gauge railways were constructed mainly where there was a need for tighter curves, smaller structure gauges, and lighter rails, as they could be less costly to build, equip and operate than standard gauge railways (particularly in mountainous or difficult terrain).[1]
Narrow gauge railways in Britain used various gauges. 2 ft 3 in (686 mm) was relatively uncommon; in his book Railway Adventure, L. T. C. Rolt states that apart from the Talyllyn, the only public railways to use the gauge were the Corris and Campbeltown and Machrihanish railways.[2][a] However there were several private railways, including mine and quarry railways, which used the gauge.
^Spooner, Charles Easton (1879). Narrow Gauge Railways. p. 71.
^Rolt, L. T. C. (1998). Railway Adventure. Sutton Publishing. p. 47. ISBN 0-330-02783-2.
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