![NOAA Photo Library Image - corp1091](https://webarchive.library.unt.edu/eot2008/20090509113512im_/http://www.photolib.noaa.gov/700s/corp1091.jpg)
Cat train on the way to a triangulation station for observations
Termed an "O" train, for triangulation observations
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Image ID: corp1091, NOAA At The Ends of the Earth Collection
Location: Alaska North Slope
Photo Date: Spring 1950
Photographer: Rear Admiral Harley D. Nygren, NOAA Corps (ret.)
• High Resolution Photo Available
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