Exmouth Junction is a confusing name for the East sidings (Morrrisons) and West sidings (now a car park) and should really been confined to the junction from the main line to the Exmouth Branch.
Historically, Exmouth Junction was a major (11 road) engine shed and goods marshalling yards, and the name probably covered the whole Cher-bang. I think there was a works there judging by how many concrete thingies are described as "cast at Exmouth Junction". With many of those facilities now gone, are we left with isolate and seemingly illogical packet of facilities described as "Exmouth Junction"?