Challenger

challenger English Etymology From en challenger. Pronunciation en /ˈt͡ʃælɪn(d)ʒə/ RP en LL-Q1860 (eng)-Vealhurl-challenger.wav Southern England en /ˈt͡ʃælənd͡ʒəɹ/ GA en Chal leng er Noun en rail transport A steam locomotive of the 4-6-6-4 wheel arrangement. en 1959 David P. Morgan Steam’s Finest Hour Kalmbach Publishing Co. 102 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. en tennis also attributive en challenger a match, tournament, or tour of the second-highest tier organized by the Association of Tennis Professionals. Translations steam locomotive of the 4-6-6-4 wheel arrangement Further reading 4-6-6-4 Space Shuttle Challenger Space Shuttle Challenger