Talk:List of track gauges

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Swedish inches

After 1863 there were 10 inches (tum) to the foot (fot). Before that, there were 12. There appears to be inconsistencies for the conversions to millimetres. The whole-fot gauges convert as expected: 3-fot → 891mm and 4-fot → 1188mm.

The Hällefors-Fredriksberg Railways has 2ft 7⁹⁄₁₆in, which – if taken as English units – converts nicely to 2-fot 7-tum, which is supported as a gauge by http://www.trefoten.se/sweng.html (although that site doesn't supply references). With 10 tum to the fot, 2-fot 7-tum converts to 802mm, which is shown correctly on this page.

The conversion for 28 Swedish inches is only correct if it's assumed there are 12 tum to the fot, giving 693mm. If the date is after 1863, the conversion should be 832mm.

The conversion for 44 Swedish inches in incorrect. If it's before 1863 (with 12 tum to the fot), the conversion should be 1089mm, which makes 1099mm look like a typo. If it's after 1863, the conversion should be 1306mm.

The page listed above implies that all of these railways were built between 1870 and 1920, so they should all be 10-tum to the fot. But https://en.wikipedia.org/wiki/Swedish_units_of_measurement states that the ⅒ division was "not much accepted by professional users in mechanics", and non-Swedish documenters might have assumed the ¹⁄₁₂ division of feet from other countries.

Is there a good source which can confirm whether the fot is 10 tum or 12 tum for these railways, and is there a way to resolve the 44 tom <> 1099 mm discrepancy?

(unsigned [1] DePiep (talk) 05:54, 1 March 2023 (UTC)) 118.211.127.217 (talk · contribs · WHOIS) 03:47, 1 March 2023 (UTC)[reply]

Background

In {{Track gauge}} § List of defined track gauges

693 mm (2 ft 39⁄32 in) (in this List)

891 mm (2 ft 113⁄32 in) Swedish three foot (in this List) "trefotsbanor, 3 Swedish feet" in Swedish three foot gauge railways

From Narrow-gauge railways in Sweden:

Still other but lesser used gauges in the country were 693 mm (2 ft 3+9⁄32 in), 802 mm (2 ft 7+9⁄16 in), 1,099 mm (3 ft 7+1⁄4 in), 1,188 mm (3 ft 10+25⁄32 in) and 1,217 mm (3 ft 11+29⁄32 in),^[1] all converted or removed.