Okay, so here are maps taken from Microsoft's Train Simulator, v1.0, captured from the Activity Editor, showing all of the switches of Marias Pass, and indicating whether the switches are manual or automatic. Manual switches maybe thrown by the user during any activity; automatic switches are controlled by the sim, and the activity designer (that's you) must set paths through the switches to get them to be set properly. For "point-a-to-point-b" activities, this is normal and not a problem.

For switching activities (which I tend to think are more challenging and hence more fun), this means that to setout cars into a siding that's accessed through an automatic switch, the activity designer (that's you, again) must reverse a path, take the "other" route into the siding, and reverse again to get back out. This also means that if you're near another siding that the activity user can switch, you need to let the user know which to do first, or you run the risk of having the sim out of skew and unplayable (i.e. red signals, switches set against the player, etc.)

Anyway, in order from west to east, (detouring south from Columbia Falls to highlight Kalispell), here are the maps, (they're also available on my website at www.geocities.com/djaquay/train.htm):

Whitefish-west
Whitefish-east
West Columbia Falls
Columbia Falls-wye
Kalispell-north
Kalispell-central
Kalispell-south
Columbia Falls-yard
Conkelly
West Coram
Belton
Red Eagle
Essex-north
Essex-south
(unnamed siding RR-east of Essex)
Blacktail Siding
Balloon track
Bison siding
Glacier Park
Spotted Robe
Browning
Blackfoot
Meriwether
Pardue
Cutbank
Shelby