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A Runaway Turn-Table.
(The above turntable is hand operated, but here is
    a story about 
a steam operated railroad turntable incident published
    in Railroad
      Gazette, 28
  July 1882.)
A singular occurrence took place recently at the Pittsburg round-house,
  on the Pennsylvania Railroad. A laborer was engaged in whitewashing the pit,
  when it became necessary to have the turn-table moved. Although there is an
  engineer in charge of the little engine which runs the table, the laborer thought
  to save time and
  trouble by starting it himself. He turned on the steam and the table
  started around, but when he attempted to stop he made a mistake and
  turned on all the steam in the boiler. The table went faster and
  faster until it made about 40 revolutions a minute, the whitewasher
  vainly attempting to stop it. Workmen stood on the edge of the pit
  and tried to shout to the laborer to turn the little wheel in the
  other direction, but for a time the experimenter failed to catch the
  idea. In the meantime an old man who had been upon the table when it
  started had thrown himself down and was holding on to the railroad
  track for dear life, thinking every minute that he would be hurled
  off and ground up. Fortunately nothing like that occurred. The
  whitewasher finally got the right idea. He began to reverse the
  wheel and soon the table was brought to standstill with no
  casualities whatever. 
  Courtesy Wendell Huffman, from
the R&LHS Newsgroup.