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2 definitions found
 for TMRC
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  TMRC
   /tmerk'/, n.
  
      The Tech Model Railroad Club at MIT, one of the wellsprings of hacker
      culture. The 1959 Dictionary of the TMRC Language compiled by Peter Samson
      included several terms that became basics of the hackish vocabulary (see
      esp. foo, mung, and frob).
  
      By 1962, TMRC's legendary layout was already a marvel of complexity and has
      grown in the years since. All the features described here were still
      present when the old layout was decommissioned in 1998 just before the
      demolition of MIT Building 20, and will almost certainly be retained when
      the old layout is rebuilt (expected in 2003). The control system alone
      featured about 1200 relays. There were scram switches located at numerous
      places around the room that could be thwacked if something undesirable was
      about to occur, such as a train going full-bore at an obstruction. Another
      feature of the system was a digital clock on the dispatch board, which was
      itself something of a wonder in those bygone days before cheap LEDs and
      seven-segment displays. When someone hit a scram switch the clock stopped
      and the display was replaced with the word ?FOO?; at TMRC the scram
      switches are therefore called foo switches.
  
      Steven Levy, in his book Hackers (see the Bibliography in Appendix C),
      gives a stimulating account of those early years. TMRC's Signals and Power
      Committee included many of the early PDP-1 hackers and the people who later
      became the core of the MIT AI Lab staff. Thirty years later that connection
      is still very much alive, and this lexicon accordingly includes a number of
      entries from a recent revision of the TMRC dictionary.
  
      TMRC has a web page at http://tmrc-www.mit.edu/. The TMRC Dictionary is
      available there, at http://tmrc-www.mit.edu/dictionary.html.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  TMRC
  
     /tmerk'/ The Tech Model Railroad Club at MIT, one of the
     wellsprings of hacker culture.  The 1959 "Dictionary of the
     TMRC Language" compiled by Peter Samson included several terms
     that became basics of the hackish vocabulary (see especially
     foo, mung, and frob).
  
     By 1962, TMRC's legendary layout was already a marvel of
     complexity (and has grown in the thirty years since; all the
     features described here are still present).  The control
     system alone featured about 1200 relays.  There were scram
     switches located at numerous places around the room that
     could be thwacked if something undesirable was about to occur,
     such as a train going full-bore at an obstruction.  Another
     feature of the system was a digital clock on the dispatch
     board, which was itself something of a wonder in those bygone
     days before cheap LEDS and seven-segment displays.  When
     someone hit a scram switch the clock stopped and the display
     was replaced with the word "FOO"; at TMRC the scram switches
     are therefore called "foo switches".
  
     Steven Levy, in his book "Hackers", gives a stimulating
     account of those early years.  TMRC's Power and Signals group
     included most of the early PDP-1 hackers and the people who
     later bacame the core of the MIT AI Lab staff.  This
     dictionary accordingly includes a number of entries from the
     TMRC dictionary (via the Hacker Jargon File).
  
     [{Jargon File]
  
     (2008-06-30)
  

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