A Knight and an 'A4'

The jigsaw in today's post, 26 February 2025, depicts an illustrative painting by Robert Barry titled Knight Train. The Big 500-piece jigsaw from House of Puzzles shows the name of the famous locomotive engineer Sir Nigel Gresley being carried by the class 'A4' 4-6-2 locomotive, No.60002. (No.60002 was actually named Sir Murrough Wilson in 1939). Is this painting in memory of Gresley? Was it a scene from a Preserved Railway ceremonial event? If anyone knows what the painting truly reflects please get in touch and I will add the details retrospectively.

Robert's painting is very 'busy' with the following inclusions - a dog, two children, three adults, two postmen and their mail van, a hovering kestrel, a peacock butterfly, several buildings, a flowering cherry tree, a hay cart, a station platform, several flowers, a double signal gantry, and the locomotive in BR Blue livery(?). Oh.... and a red squirrel.