IDWSInterim Defensive Weapon System (US DoD)
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Specifically, these options include installing an IDWS fence at 12 feet above track level, limiting the speed of both transit and railroad trains when they pass one another, and scheduling railroad trains at periods when transit trains are either not running or running at infrequent intervals.
It should be obvious that the IDWS was an ineffective solution at best.
If the hot-wire was broken or the fence was tipped more than 30 degrees by an intruding train, the IDWS system was designed to send a signal to METRO Operations Center.