It’s is vaguely reminiscent of the “thistle” headboard that was carried by the Flying Scotsman train during the sixties and seventies, but that was a much more substantial, “beefier” thistle crest made of fibreglass that must surely have measured about four feet across.
Having browsed the internet I can’t find any mention to the “We Serve” motto either, so in short I’m afraid I can’t identify this item, be it railway related or otherwise.