This from Andrew McCullough:

This is a scan of one of my father’s slides. He was engineer on E5 at the time.  The engine is a 1969 Seagrave 1500 GPM.  It was close to new here, so this must be 1969-70. 
Location is E5’s quarters 324 S Desplaines St.  Photo by the late John McCullough.
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John McCullough photo