Southern Pacific Switching Layout

[FCIN]

But what would the difference be in operations of an End of a Branch-line and an Industrial Park?

For all intents and purposes, there wouldn't be any difference other than the theme of your layout. If it represents the end of a branch, then the train would be your local freight arriving, working, and departing back to its origin terminal. If it represents an industrial spur, then the train would be coming on to the spur from a nearby yard with whatever traffic it had for the spur.

If your theme was a separate company operating an industrial area such as what SMS Rail Lines operates in Pureland, NJ http://www.smsrail.com/map_detail.htm, then you'd have a different operating theme, wherein your short line must interchange its traffic back and forth to a connecting line and keep its motive power on its own line. Countless operations like that around the country.

To me, your track plan just seems to say "end of the branch", but that doesn't mean it has to be treated that way. I just gave you three possible themes that you might consider for your current track plan, any of which would be interesting. Treating the plan as though it were a short line or switching/terminal road, would add a little more operation.

Ultimately, it's up to you what theme and era you want to go with.