Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.

South Yards at the Chicago & North Western Proviso Yards. December 1942. View full size. 4x5 Kodachrome transparency by Jack Delano.
Note the big white X's on the doors of that row of boxcars in the distance.
Explosives, subject to special handling.
Somebody kept track of those cars at all times.
In the foreground appears to be a program to rehab a batch of old passenger train insulated milk cars (note the express trucks, more visible in another shot apparently in the same session). That other shot also shows one car lettered as MILK. They don't appear to be iced, no hatches at the ends of the roof, but there may have been some other way to ice them, at least in hot weather. They ran in passenger trains to gather milk to the city. Milk cars were also used in passenger trains extensively in the east, Boston + NYC.
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