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Ghostbusters - timeline
The Tunguska blast, a major interdimensional time-rip, occurs.
The 'City of Albany' central train derails killing hundreds of people, later to become a ghost train. (New York)
Philadelphia Mass Turbulence, related to 'symmetrical bookstacking'. (Philadelphia, PA)
Raymond Stantz, Egon Spengler and Peter Venkman form the Ghostbusters.