From Library of Congress:
Title from back of card.
Summary: Stereograph showing wounded soldiers on railroad cars at Savage’s Station, Virginia.
Photographed by Brady & Co. (Washington, D.C.),
Part of the series, Photographic History. The War for the Union. War Views. Library of Congress Prints and Photographs Division Washington, D.C.
Record page for this image: http://www.loc.gov/pictures/item/2010648600/