The first spur, which is the farthest east on the base, has the loading ramp.
You can follow the old spur (yellow dots) I laid out on the satellite picture. This is most likely a weapons/munitions spur that received the warheads, and transported by vehicle to the missile silos out on the praire.
Looking east towards both spurs.
Towards Great Falls Yard.
I recall reading a story concerning transporting a missile from Harlowton to Malmstrom. I need to located this article as it was a great story.
More to come, if you have any information/pictures you can share of this area back when operational, please let me know.