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March 1943. "Kiowa, Kansas. An Atchison, Topeka & Santa Fe rail detector car. These cars are actually traveling scientific instruments, which not only detect faulty rails but also record the place and extent of the defect." Photo by Jack Delano, Office of War Information. View full size.
BNSF still runs these on that route, usually as a conventional locomotive, a heavy tank car (for weight) and a passenger-like car following with instruments taking observations.
Called geometry trains.
This two car combination is considered to be a train. The end facing the camera has Classification lights on the front sides and the other end has Marker lights on the back sides, making it an official train.
It also has a flag behind each classification light. I can't determine what color they are. If they are white, it is considered to be an "extra" movement, probably Extra 9165. If they are green, it may be an advanced section of a scheduled train and the green flags denote another section following.
Railroads when they were interesting.
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