Having been in the motorcar hobby for 10+ years now and collecting what I can regarding the hobby...I present my US&S MC-I or Motorcar Indicator Operating Unit along with some other photos from Albina Yard in Portland, Cheney Washington, the Deschutes River bridge, OR, West North Dalles, WA, and an unknown location on the UP.
I remember as a child seeing these motorcar indicators along the UP east of Portland all the way to at least the Deschutes River bridge. I learned how to read them on I-84 between MP 1 and Rockwood as being a passenger in the folks car I would watch each pair of them mounted on the aspect signal poles seeing them all vertical (clear). I could tell when I was going to see something up ahead on the rails by one of two indicators would show horizontal (occupied).
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
exSP&S MP 54.6, Maupin Oregon Motorcar Indicator
Photo from video capture in Albina Yard, Portland Oregon (mid 1990's)
Near Cheney, WA May 2010
Near Cheney, WA May 2010
Near Cheney, WA May 2010
West end of the Deschutes River Bridge, OR (1980's)
Photo from the newsgroups of a BN eastbound near West North Dalles, WA (Aug 1970)
Photo from the newsgroups of UP 805 at a control point with the indicators to the far left.
-Kevin