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The English Electric System 4, often referred to simply as "System 4," is a type of railway signaling system that was developed by English Electric. It is an advanced, electronic-based system used primarily in railways for the purpose of controlling train movements and ensuring safety through the automation of signaling processes.

Ancestors (6)

  1. Early British computers
  2. History of computing in the United Kingdom
  3. History of computing
  4. History of mathematics
  5. Mathematics
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