4. Railway switches and signals
  5. Cab signal or train control
  6. Speed-control systems
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Railroad communication system

Railway switches and signals – Cab signal or train control – Speed-control systems
Patent

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Railway car retarder system

Railway switches and signals – Cab signal or train control – Speed-control systems
Patent

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Railway train speed restriction apparatus

Railway switches and signals – Cab signal or train control – Speed-control systems
Patent

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Retarder control system for automatic railroad classification ya

Railway switches and signals – Cab signal or train control – Speed-control systems
Patent

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