What used to be here?

So i was looking around Google maps and noticed they haven't really updated to Ariel view of this part of anchorage for a long time, when i go to street view i can see theirs a bunch of buildings here now but this old view i found interesting, mainly because of the old railroad tracks running in a sorta loop here.

Did the railroad have some sorta facility here or what's the dealio cause I'm genuinely interested on what used to be here