http://www.southernsteamtrains.com/flyingscotsman.htm

briefly mentions the Flying Scotsman USA tour in 1969

Stirling single

Don’t miss the Stirling Single at York, in my opinion one of the most beautiful locomotives ever built.

I was at Grantham in the mid-1950s and we used to put pennies (remember them?) on the track where the LNER Pacifics slowly crushed them to twice normal size while backing up to the sheds. Halcyon days! Health and safety would be horrified at the things we kids used to do! Of course I’m a Grandpa now!

The second one is the McDonnell XHJD-1 44318 from 1946, later redesignated XHJH-1

6233 Duchess of Sutherland

Come on, chaps, this is a steam locomotive, not a steam train, the locomotive and coaches behind it form a train!

Courtesy of
http://www.david.element.ukgateway.net/steamlocomotives14.htm

(Rlangham, your link didn’t work for me)

The S.31 “baby Stirling” was a single-seater, first flown by John Piper at Rochester Airport on 19 September 1938. Later flown by several other pilots.

Could that be the KD equivalent of the laurel wreath badge? Or a Warrant Officer’s badge?
It’s a very long time since I wore KD, but I have vague memories of something like that. I was only a Sergeant at the time, but lived in the Sergeant’s Mess, of course.