Above, a 1949 overhead view of the Tappan interlocking, with notations by Dan Meinhard.  Note the C&O in light blue, the DBC&W in yellow near the top and the PH&D in purple.  [Detroit Edison Maps, Wayne State University collection].  Below, a drawing of the track diagram at Tappan by T. J. Gaffney.  The map is reversed from the overhead view above.  The direction to the right is west, towards Lapeer.  [T.J. Gaffney]