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[quote]QUOTE: Originally posted by hogger42 [quote]QUOTE: Originally posted by Doggy Dosnen't BNSF have some of them DOGGY [/quote] Yes, BNSF has them and they make a big difference, nice and quiet.[:D] [/quote] And the "W" indicate what ? No, not the whisper cab. This feature is indicated with an "I" (Isolated) and often - SD70MAC and SD90MAC - GM makes no difference between the normal Widecab and the wide Whisper cab. With logic "IW" couldn´t stand for the Whispercab because the "I" alone in a GM designation stands also for the Whispercab. And the SD70´s with the wispercab are designated SD70I, not SD70IW!!!!
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