First year for the Hudson. Trailing truck correct. Tender needs Flyer's special 4 rail track to activate whistle. You can see an ebay listing here.PREWAR AMERICAN FLYER O GAUGE TRAIN WHISTLE TRACK 4 RAIL BANKED CARDBOARD BASE. I have a couple of these Hudsons and some will make it on lionel's 31" diameter curves but they don't like it. They were designed for 40" I believe. Nice smooth runners.
Dan