On Fri, 26 Apr 1996, Shel Michaels wrote:

>    DCC (Digital Command Control) has a very active standards group.  The many
> dedicated volunteers have done an exceptional job of creating a unifying
> standard of communication for model railroad setups.  They work under the
> aegis of the NMRA (National Model Railroad Association), their home page is:
> http://www.mcs.net/~weyand/nmra/nmrahome.html
> The standards themselves are purchasable as print at some model railroad
> stores, and are supposed to be available on the net sometime - I'm not sure
> if they're there now.

See also D.S.Dawdy's Cyberroad pages at

  http://www.mcs.net/~dsdawdy/cyberoad.html

He seems to have more information on DCC per se, where Rich Weyand hosts
the NMRA's home pages.  I thought there used to be an online (draft) DCC
standard, but I don't thin it's there any longer.  Then again, the link
that's supposed to lead to the "NMRA standards and documents" section
weren't working when I was poking around.  I believe you can find that
link from various places in both Dawdy's and Weyand's web sites.