This is the producer for the classes defined in SimDataFormats/TrackingAnalysis. These classes provide an easier to use interface to both the HepMC (generator) information and GEANT (simulation) information. These objects can then be associated with reconstructed tracks and vertices.
It uses the config file trackingParticles.cfi
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The action of the producer and .cfi file are documented in https://twiki.cern.ch/twiki/bin/view/CMS/SWGuideTrackingTruth