Talk:Narrow-gauge railways in Sweden

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1099mm = 44 Swedish inches?[edit]

(Aron-Tripel) About this statement about rail gauge 1099 mm:

1099 mm is equal to 44 Swedish inches

Christinehamn - Sjöändans järnväg [sv];ref: Järnvägarna runt Filipstad (converted to standard gauge)

"1099 mm" is in the source. Conversion: 1,099 mm (43.268 in) or 1,099 mm (43+9⁄32 in). I could not find a definition for "Swedish inch". It is mentioned in the lede Swedish units of measurement, but not in the lists below and it has no metric number. Nor is some "inch" in sv:Gamla svenska mått.

1099/44 would mean: 1 Swedish inch = 24.977272727273 mm. -DePiep (talk) 07:50, 15 May 2014 (UTC)[reply]

@DePiep:: Swedish units of measurement: See "tum (thumb). https://sv.wikipedia.org/wiki/Tum#Svensk_tum = 24,742mm. http://www.trefoten.se/sweng.html states on the 1,099mm gauge, contrary to the other Swedish measured gauges, "on the wheels", which indicates not measured "between the flanges of the wheels" or between the inner faces of the rails. The latter method of measurement is common. The conversion of the 28 Swedish thumb gauge to mm (rounded: 693mm) is correct, I just verified. So the 1,099 is properly sourced, the method of measuring this 44 thumb is unclear to me. --Aaron-Tripel (talk) 08:42, 15 May 2014 (UTC)[reply]

693 mm. OK, sourced & correct conversion then (by 1 Swedish tum = 24.74 mm). Will be in {RG}. The trefoten source says "11 km" for this one; shouldn't it have a section then in this article?

1099 mm. Mentioned in two sources, will be in {RG} then.

I understand the "on the wheel" point (same with these Italian gauges, though there we know the between-gauge). I note that the Filipstadtgille reference says: "The traffic was opened in 1851 for horse operation. 1858 acquired first locomotive. The track width was 1099mm." (ggl transl). That can explain the odd size, and the "on the wheels" definition.

But some questions remain: how is it "44 Swedish tum", measured & calculated, in the sources? Which tum conversion number is it? There are three in history: "1/12 fot, 2.474 cm. After 1863 1/10 fot, 2.96 cm, ... English inch (2.54 cm, abandoned only late 20th century) and metric system".

All this could be improved in the article. Only if new sources appear, the "1099 mm" in {RG} may have to change. -DePiep (talk) 09:29, 15 May 2014 (UTC)[reply]