Talk:LNER Class A1

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New article

I have upgraded this to an article, see Talk:LNER_Peppercorn_Class_A1#Infobox_proposal. I will expand the comparison table shortly but, if anyone else wishes to make additions or corrections, please do. Biscuittin (talk) 11:13, 3 January 2009 (UTC)[reply]

This should be a disambiguation page

user:Biscuittin in particular; this should be a disambiguation page. What happened was that the LNER used the A1 classification, and then when Class A1 was extinct (because all had been transferred to Class A3), it was reused for later modern engines. So it's just a name that was reused; the relationship between the two isn't really direct enough for its own article. In the same way that the Raven Class A2s are not directly related to the Peppercorn and Thompson A2s, though they shared the same name.

However, I agree it's worth comparing the leading dimensions of LNER Pacifics but that should be done at LNER Pacifics, not here. That way the A2, A2/2 A2/3 (even W1) can be compared as well as everything else.

If there are no objections, I'll go ahead and do it. Thanks, Tony May (talk) 22:15, 3 November 2010 (UTC)[reply]

OK, I have no objection. Biscuittin (talk) 23:09, 3 November 2010 (UTC)[reply]

At no point was the classification A1 ever truly vacant on the LNER. As is well known, A1 originally referred to the Gresley pacifics as built, with boilers pressed to 180 lb/sq in; and as these were rebuilt with 220 lb boilers, they were reclassified A3. So far, so good.

But in 1945, when Thompson rebuilt no. 4470 Great Northern, that loco was one of 18 (4470/2/5/6/81, 2543/6-8/50/6/7/62/4/5/7/9/72) out of the original 52 which were still running with 180 lb boilers. At that point, on rebuilding with 250 lb boiler, repositioned cylinders and three sets of valve gear, no. 4470 retained the classification A1, which thus gained a new use; and the 17 not rebuilt by Thompson were reclassified A10 (rebuilding to A3 continued until A10 was extinct in December 1948). No. 4470 (by then no. 113) was reclassified from A1 to A1/1 in January 1947, when Peppercorn's version was at the design stage, so that the latter could be A1. --Redrose64 (talk) 19:11, 6 November 2010 (UTC)[reply]