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 0 in)   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)
Change of gauge
Break-of-gauge Dual gauge Conversion list Bogie exchange Variable gauge
By location
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Swedish three-foot gauge railways (Swedish: "trefotsbanor") are railways with the gauge 891 mm (2 ft 11+3⁄32 in), or 3 Swedish feet in the old Swedish measurement system.^[1] Railways with this gauge have only existed in Sweden.^[1] This was the most common narrow gauge in Sweden.^[1] As of 2016, the total network with this gauge is 65 km (40 mi), all of which is electrified^[2] (excluding lines which only remain as heritage railways).

Sweden once had some fairly extensive narrow-gauge railways, but most are now closed. Some were converted to standard gauge (the latest one was KBJ, Kalmar - Berga Järnväg, between Berga and Kalmar in the 1970s) and some remain as heritage railways.

The only commercial Swedish three foot gauge railway still in use is the suburban railway Roslagsbanan ('the Roslagen Railway') in north-eastern Stockholm. The parts of this railway which is still in use will be in continual use in the foreseeable future, with new trains to be delivered in 2020^[3] and there are even plans for a new line to connect this railway to Arlanda Airport.

A branch line of Roslagsbanan, Långängsbanan, was built in 1911 and ran for some years as an isolated 1,435 mm (4 ft 8+1⁄2 in) standard gauge tramway in anticipation of a planned conversion of the main line to raise its capacity, but those plans came to naught and the branch was rebuilt to narrow gauge in 1934; it is closed since 1966.

The Nordmark-Klarälvens Järnväg (NKlJ) was a 175 km (109 mi) network issued from different lines built from 1873. It was electrified in 1920, with 15 AEG-locomotives. A new class of 5 locomotives (ASEA) went in 1961. The network was dismantled in 1990. Only Karlstad-Skoghall was regauged to standard gauge and transferred to SJ.^[4]

The longest remaining Swedish three foot gauge railway is the 126 km (78 mi) heritage line from Åseda to Virserum, Hultsfred and Västervik. 70 km (43 mi) between Hultsfred and Västervik are served by daily tourist trains in the summer, including 4 km (2.5 mi) of dual gauge track. Tourist railbuses also run along the southernmost 27 km (17 mi) (Åseda–Virserum), albeit less frequent. The middle section (Virserum–Hultsfred, 29 km (18 mi), is only used by draisines or not at all.

The Vadstena–Fågelsta narrow gauge railway was part of a larger network in Östergötland.

The gauge difference to the internationally much more used 900 mm (2 ft 11+7⁄16 in) is small, only 9 mm, and some used 900 mm vehicles have been brought to Sweden and given a slight wheel adaptation (reducing the flange by 4 mm or 0.157 in using turning)^{[citation needed]}.