Are you sure that would have had the early crest Rob?
We moved to Dumfries in the summer of 1965, just up the road from Maxwelltown station on the Port Road. There was a rail-served oil depot in the goods yard.
Wiki says the line closed in August, certainly I never saw passenger trains. There was still freight-long trains of vans to ICI at Cargenbridge, and what I presume now to be demolition trains. I did see one steam loco. Dad told me it was a "mogul"; I'm pretty sure it wasn't a crab, but I don't know if it was a Standard or an Ivatt class4.
Ed