I have a 1936 A/F UP streamliner set - City of SanFrancisco M10005 .The set has no whistle , as A/F deleted the whistle in 37 , was the 36/37 a stand alone whistle mech , can I fit a mech from a pre war / post war whistling bill board without too much trouble . Other than the correct whistle , what else will I need to get it to work as in 36 ?
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