Wheels of Time 50186 N Scale 53'6" General Service Flatcar Conrail CR 6 Pack Union Pacific - UP (1) 12x18x4

(1) 12x18x4

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Wheels of Time 50186 N Scale 53'6" General Service Flatcar Conrail CR 6 Pack Union Pacific - UP (1) 12x18x4Wheels of Time 50186 N Scale 53'6" General Service Flatcar Conrail CR 6 Pack These 53' 6" flatcars were constructed with a welded fish belly steel frame in contrast to the cast steel GSI frame. The fish belly frame provided an optimal distribution of tension and compression forces from the center of the car to the bolsters. Think of it as a bridge. In addition, fabricating a welded frame was far less labor intensive than an equivalent riveted frame.