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thereallg thereallg
wrote...
4 years ago
All of the following were technological advances for railroads except the
 
  a. move from iron to steel tracks.
  b. adoption of knuckle couplers
  c. use of automatic signals.
  d. introduction of air brakes.
  e. switch from the open-hearth to the Bessemer process in steel mills.
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4 years ago
e
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