{"product_id":"kadee-ho-504-a-s-f-ride-control-50-ton-trucks-with-33-smooth-back-wheels","title":"Kadee HO 504 A.S.F. Ride-Control 50-Ton Trucks with 33\" Smooth Back Wheels","description":"The A.S.F. A-3 Ride Control 50-ton freight truck was introduced in the 1940s and is one of the forerunners of modern freight trucks. Features embodied into this design include a longer spring travel, no spring planks and constant friction control using friction castings in the bolster to dampen excessive lateral roll of the car. These design features allowed for a higher train speed with less danger of derailment than previous designs. A.S.F. sold over 140,000 sets by 1949. This truck is excellent for modeling the transition era up to 1994 when friction bearings were no longer allowed in interchange service\u003cbr\u003e\u003cbr\u003e#520 Code .110 33\" Smooth Back Wheels and #637 HO Truck Springs\u003cbr\u003eAccurate Markings\u003cbr\u003eIncredible Detail True to Prototype\u003cbr\u003eNon-magnetic Metal Wheels\u003cbr\u003eHighly Flexible Sprung Trucks\u003cbr\u003eMetal SideFrames and Fully Sprung Bolster\u003cbr\u003eSmooth Tracking Free Rolling Contoured Insulated Axles\u003cbr\u003eRP-25 Free Rolling Wheels","brand":"Kadee","offers":[{"title":"Default Title","offer_id":42130683199570,"sku":"KAD-504","price":12.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0581\/3410\/2098\/files\/KAD-504-2__84096.jpg?v=1756165935","url":"https:\/\/modeltrainstuff.com\/products\/kadee-ho-504-a-s-f-ride-control-50-ton-trucks-with-33-smooth-back-wheels","provider":"Model Train Stuff","version":"1.0","type":"link"}