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- Q7999740 subject Q7036849.
- Q7999740 subject Q8518579.
- Q7999740 subject Q8627446.
- Q7999740 subject Q8627626.
- Q7999740 abstract "Wigwag is the nickname given to a type of railroad grade crossing signal once common in North America, named for the pendulum-like motion it used to signal the approach of a train. It is generally credited to Albert Hunt, a mechanical engineer at Southern California's Pacific Electric (PE) interurban streetcar railroad, who invented it in 1909 for safer railroad grade crossings. The term should not be confused with its usage in Britain, where wigwag is generally used to refer to alternate flashing lights, such as those found at modern level crossings.".
- Q7999740 thumbnail RoundPrairieWigwag.jpg?width=300.
- Q7999740 wikiPageExternalLink www.oerm.org.
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- Q7999740 wikiPageExternalLink 2003_09.html.
- Q7999740 wikiPageExternalLink going_wiggy_over_wig-wags.htm.
- Q7999740 wikiPageExternalLink wig.htm.
- Q7999740 wikiPageExternalLink WIG_WAG_PAGE1c.htm.
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- Q7999740 wikiPageWikiLink Q7036849.
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- Q7999740 wikiPageWikiLink Q8518579.
- Q7999740 wikiPageWikiLink Q8627446.
- Q7999740 wikiPageWikiLink Q8627626.
- Q7999740 wikiPageWikiLink Q918747.
- Q7999740 wikiPageWikiLink Q934111.
- Q7999740 wikiPageWikiLink Q99.
- Q7999740 comment "Wigwag is the nickname given to a type of railroad grade crossing signal once common in North America, named for the pendulum-like motion it used to signal the approach of a train. It is generally credited to Albert Hunt, a mechanical engineer at Southern California's Pacific Electric (PE) interurban streetcar railroad, who invented it in 1909 for safer railroad grade crossings.".
- Q7999740 label "Wigwag (railroad)".
- Q7999740 depiction RoundPrairieWigwag.jpg.