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Talk:Caledonian Railway 721 Class

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Variations

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I am finding some conflicting information about the McIntosh 4-4-0s. According to Casserley and Johnston, the 139 Class had two variations:

  • 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

According to Locomotives of the Caledonian Railway:

  • LMS 1440-1449 were 139 Class with Schmidt superheaters
  • LMS 1450-1460 were 43 Class with Robinson superheaters

Can anyone clarify this? Biscuittin (talk) 14:24, 20 June 2012 (UTC)[reply]

You've omitted a digit from the LMS numbers. Numbering, and the St Rollox order numbers, were as follows:
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, Bertram (1984). Baxter, David (ed.). British Locomotive Catalogue 1825-1923, volume 4: Scottish and remaining English Companies in the LMS Group. Ashbourne: Moorland Publishing. p. 87.
  • Cornwell, H.J. Campbell (1974). Forty Years of Caledonian Locomotives 1882-1922. Newton Abbot: David & Charles. pp. 137–140, 143, 188. ISBN 978-0-7153-6533-5.
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. --Redrose64 (talk) 17:08, 24 June 2012 (UTC)[reply]
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