This Category is to add a Kadee 550 Series Truck Set with Code 110 wheelsets to your Westerfield Kit. PLEASE NOTE: ADD-On Items are not available to order with Kits in Series #12400/ 12500-12700 and 12800. Please specify which Kadee truck you would like to order in the comments area. Please note that this item must be purchased with a Westerfield Kit. Kadee products are not available separately. This truck is a metal, fully sprung self centering equalized truck with code 110 wheelsets. Please see the Kadee website for more information.