Between Mileposts 42.0 to 40.0 (Westward) slide detector fences were installed to prevent trains from running into fallen
rocks from the sandstone bluffs along the St. Croix Valley. Sometimes large chunks of sandstone will bust loose, landing
on the tracks. Trains coming around the curves through the bluffs would not have time to stop and then run into them
The Soo Line timetable stated the following concerning the slide detector fences:
"Slide Detector Fences are in service between MP 40 and MP 42 between Marine and Osceola. If slide is detected,
a radio will transmit an intermittent tone for five seconds to alert train crews. Automatic Block Signals will also
be caused to display Restricted Proceed Indications. Trains proceeding on a Restricted Proceed Indication should advise
Dispatcher if any unsafe condition is noted in the area."
Western Division Timetable #20, Effective January 1, 1984.
The following four photos were taken from the cab of Osceola & St. Croix Railway #559, painted in a Soo Line
inspired maroon and gold paint scheme during the summer of 2005. The following photos were taken by Gary Muehlius
of Redmond, WA and used with his permission.