FILE - In this 1864 photo made available by the Library of Congress, Gen. William T. Sherman's Union troops use a lever especially designed by his engineers to tear apart train rails as they march ... more 
FILE - In this 1864 photo made available by the Library of Congress, Gen. William T. Sherman's Union troops use a lever especially designed by his engineers to tear apart train rails as they march through Georgia during the American Civil War. The rails were half the weight of modern-day rails and were pried up easily. To make Confederate pursuit impossible, they were destroyed beyond repair using a technique called "Sherman's neck ties." A large shell hole is in the building at left. less 
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Associated Press | Photo By Library of Congress
Sat, Apr 2, 2011 10:29 AM EDT