I think we are getting to the bottom of this!
Yesterday I checked with a friend of mine with a vast collection of railway pictures (not all of them his own) if 60009 had a late overhaul in Darlington Works. He sent me a picture of it receiving attention to the smokebox area, dated 3rd April 1964. This must be the occasion which has been mentioned several times on this thread, with the side-on views of the loco.Why it needed attention so soon after leaving Doncaster Works (November 1963) is still not clear (to me, anyway!)
I would suggest that this seems the likely time when the crests were removed from the cab sides. Seems logical?
So, pre-April 1964, with crests on cab sides. After April 1964, no crests.
Regarding the last A4 to be overhauled at Darlington Works. I would also suggest 60034 Lord Faringdon.
Here's one of mine of this loco taken on a Works Open Day on 3rd April 1965, with A3 60052 Prince Palatine beyond.
You will have to take my word for it that it is 60034 as the cab end (which presumably had the number on it) is out of shot on the right.
HOWEVER this was not the last A4 to reach Darlington Works for an overhaul.
In May 1965 60010 Dominion of Canada arrived for attention (my friend has sent me a pic of this as well, dated 10th May 1065) but it was condemned due to the condition of the boiler, so it never went through the Works after all. It stood for several months on the site of Darlington mpd, (latterly minus its chimney) until it was towed to Crewe Works and cosmetically restored to BR late livery condition in 1966 for presentation to Canada. And, the rest, as they say, is history ... (Shildon Great Gathering, etc)
That would make a good pub quiz question - what was the last A4 to visit Darlington Works?
(Some of this information comes from the RCTS book 'Locomotives of the LNER Part 2A)
Edited by Trev52A, 20 January 2018 - 19:34 .