Talk:GWR 850 Class

Discrepancies
There are some discrepancies between GWR 850 Class and GWR 1901 Class. I will try to sort these out. Biscuittin (talk) 19:25, 7 December 2014 (UTC)


 * Good luck! le Fleming (RCTS Six Coupled Tank Engines) lists them all under one class (850), but then goes on to say that they started as two distinct classes (850 and 1901) which merged into one class on rebuilding... Robevans123 (talk) 20:31, 7 December 2014 (UTC)

Tanks
Either they were not all rebuilt with pannier tanks or the photo of (allegedly) No. 2007 is wrongly captioned. Biscuittin (talk) 19:37, 7 December 2014 (UTC)


 * Checking the RCTS book on Six Coupled Tank Engines, No. 2007 was one of 17 (850s and 1901s) that were not pannierised. Robevans123 (talk) 20:31, 7 December 2014 (UTC)


 * Thank you. Could you please give the full title of the book, and the page numbers, so I can add it as a reference. Biscuittin (talk) 14:38, 8 December 2014 (UTC)


 * The book is *. It is the same one given in the Sources section of the article (but I've split the title into series and title). The page range covering the whole topic is E43-E50, but the specific reference for No. 2007 is E50. If you want to list all the ones that weren't pannierised then they are: Nos. 855, 864, 873 &990 (page E47); Nos. 991, 1216, 1904, 1913, 1925, 1932, 1933, 1939 (page E48); Nos. 1944, 1963, 1981, 1984 (page E49); and, as mentioned already, No. 2007 on page E50. Robevans123 (talk) 19:25, 8 December 2014 (UTC)
 * Thank you. Biscuittin (talk) 21:08, 8 December 2014 (UTC)

Dimensions
At some stage (perhaps when they were reboilered) cylinder bore was increased from 15" to 16" and driving wheel diameter was increased from 4' 0" to 4' 1.5" (probably by fitting thicker tyres). Were these modifications applied to all 850 and 1901 class locos? Biscuittin (talk) 21:13, 8 December 2014 (UTC)


 * le Fleming states "By this time [1908] there had been an all-round increase in dimensions which, with typical boilers, were:-" and then goes on to list the cylinder and wheel changes, and also an increase in boiler pressure (150 psi) and tractive effort (15,825 lb). But note "typical boilers", so probably unwise to say "all", better to say something a bit vague like "generally" or "most" or "typically"... This period was a time of continuing improvement (a few were fitted with 17" cylinders in 1906/7, pannier tanks were added from 1910). Churchward's ideas on standardisation didn't apply to lowly tank engines - until Collett introduced the 5700 class in 1929. Robevans123 (talk) 19:05, 9 December 2014 (UTC)