Searching several sites including the Wiring For DCC - Allan Gartner's Bible of DCC site. and Nothing NADA regarding color coding of wiring. Quite a suprise. Some was found at Copyright (c) 1995-2003 National Model Railroad Association. All Rights Reserved.
also at [Trackwork] [Index
If 'someone' has a URL to the general NMRA track/conventional controls wiring color code would appreciate same....