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Penn Central train BD-1 heads southbound on the Bay City Branch at 23 Mile Road, year Yates.  The lead engine is the 2939 (a U33B) assisted by the 3266 (a EMD GP40).  They are waiting for the signal to cross 23 Mile Road and to proceed to Sterling Yard and Detroit.  The PC had a "hold out" signal at Yates to prevent southbound trains from proceeding during congested periods at Sterling or North Yard.  October, 1971.  [Charlie Whipp]