Talk:Caledonian Railway 721 Class

Variations
I am finding some conflicting information about the McIntosh 4-4-0s. According to Casserley and Johnston, the 139 Class had two variations: According to Locomotives of the Caledonian Railway: Can anyone clarify this? Biscuittin (talk) 14:24, 20 June 2012 (UTC)
 * LMS 1440-1444 had 165 lb pressure and 20" x 26" cylinders
 * LMS 1445-1460 had 170 lb pressure and 20.25" x 26" cylinders
 * LMS 1440-1449 were 139 Class with Schmidt superheaters
 * LMS 1450-1460 were 43 Class with Robinson superheaters
 * You've omitted a digit from the LMS numbers. Numbering, and the St Rollox order numbers, were as follows:
 * {|class=wikitable

!LMS !!Cal !!Order
 * 14440 ||139 ||Y92 (part)
 * 14441-4 ||132-5 ||Y97
 * 14445-8, -, 14449 ||117-122 ||Y101
 * 14450-5 ||43-48 ||Y105
 * 14456-60 ||39-42, 123 ||Y109
 * }
 * Cal. 121 did not get a LMS number because it was scrapped in 1915 (Quintinshill).
 * Baxter divides these locos into two classes of 11: he places orders Y92, Y97 and Y101 into the 139 class, and orders Y105 & Y109 into the 43 class.
 * Cornwell describes these 22 superheated locos together, but divides them into three classes: 139 (Y92, Y97); 117 (Y101); 40 (Y105, Y109).
 * According to Baxter, the 139 class were "Cyls 19 x 26. As 140 class but fitted with Schmidt superheater, and piston valves."; the 43 class were "Cyls $20 1/2$ x 26. As 139 class but with Robinson type superheaters and larger cylinders. WP 170 lbs/sq in."
 * Cornwell shows orders Y92 and Y97 as having a Schmidt superheater, 165 lb pressure and 20 inch cyls; order Y101 differed slightly, having $20 1/2$ cyls (he notes that they are sometimes misquoted as $20 1/4$). Orders Y105 and Y109 have Robinson sup. and $20 1/4$ cyls. -- Red rose64 (talk) 17:08, 24 June 2012 (UTC)
 * Cal. 121 did not get a LMS number because it was scrapped in 1915 (Quintinshill).
 * Baxter divides these locos into two classes of 11: he places orders Y92, Y97 and Y101 into the 139 class, and orders Y105 & Y109 into the 43 class.
 * Cornwell describes these 22 superheated locos together, but divides them into three classes: 139 (Y92, Y97); 117 (Y101); 40 (Y105, Y109).
 * According to Baxter, the 139 class were "Cyls 19 x 26. As 140 class but fitted with Schmidt superheater, and piston valves."; the 43 class were "Cyls ⇭⇭⇭ x 26. As 139 class but with Robinson type superheaters and larger cylinders. WP 170 lbs/sq in."
 * Cornwell shows orders Y92 and Y97 as having a Schmidt superheater, 165 lb pressure and 20 inch cyls; order Y101 differed slightly, having ⇭⇭⇭ cyls (he notes that they are sometimes misquoted as ⇭⇭⇭). Orders Y105 and Y109 have Robinson sup. and ⇭⇭⇭ cyls. -- Red rose64 (talk) 17:08, 24 June 2012 (UTC)
 * According to Baxter, the 139 class were "Cyls 19 x 26. As 140 class but fitted with Schmidt superheater, and piston valves."; the 43 class were "Cyls ⇭⇭⇭ x 26. As 139 class but with Robinson type superheaters and larger cylinders. WP 170 lbs/sq in."
 * Cornwell shows orders Y92 and Y97 as having a Schmidt superheater, 165 lb pressure and 20 inch cyls; order Y101 differed slightly, having ⇭⇭⇭ cyls (he notes that they are sometimes misquoted as ⇭⇭⇭). Orders Y105 and Y109 have Robinson sup. and ⇭⇭⇭ cyls. -- Red rose64 (talk) 17:08, 24 June 2012 (UTC)

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