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A space shuttle, named after HMS Challenger (1858), destroyed on January 28, 1986 with loss of its seven-member crew. examples
plural Challengers
(rail transport) a steam locomotive of the 4-6-6-4 wheel arrangement. quotations examples
American Locomotive Company, which introduced the 4-6-6-4 (on Union Pacific) in 1936, constructed more Challengers than any other builder and, in Northern Pacific's Z-8 class, built the heaviest. NP owned 48 4-6-6-4's in three classes.
1959, David P. Morgan, editor, Steam's Finest Hour, Kalmbach Publishing Co., page 102