The former Mitsubishi foundry is in the background of the middle picture and visible just over the gantry. Where the formation widens to the right a trailing siding used to give access for delivery of coke and scrap iron.
I think the blue building in the top picture is a training centre run by PATC, that blue is their colour.
I am pretty sure the blue building is PATC, but I don't recall ever seeing it labelled, I know they have a fork lift school to the south west, across the train line, but I am not sure if the building in question is one of theirs or not.
Don, the top photo more or less has the former Mitsubishi site behind the photographer over their lef shoulder, it's looking down the line toward Lonsdale Station/Christies/Noarlunga/Seaford etc. The other photos are taken looking up the line toward the Lonsdale parking lot for trains/Adelaide etc.
Take a look on Google maps, the old Mitsubishi siding is still there, now depicted running past some huge sections of pipe from RPC(?) - using part of the former site, (mostly) for the desal plant. To the east you can see some of the mis-winds and resultants from the destructive testing.