4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
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Shunting device

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Car-actuated controller
Patent

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Slide cam assembly for railroad-crossing gate mechanism

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent

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System and method for train operation approaching grade...

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Reexamination Certificate

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System controlling apparatus which compares signals from sensors

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally open track circuit
Patent

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