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Door opening control apparatus

  • US 6,341,563 B1
  • Filed: 03/13/2000
  • Issued: 01/29/2002
  • Est. Priority Date: 06/19/1997
  • Status: Expired due to Term
First Claim
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1. A platform sensing and control system comprising:

  • an active wireless sensor for sensing at least the passive presence of a platform opposite a door of a railcar; and

    providing an output indication of at least platform presence in response thereto; and

    a door control controller operative in response to said output indication of at least platform presence for ensuring that normally the door is not opened other than when a platform is located opposite said door.

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