This is Atlas 50001521 N Chat 42" coil car 3519. 42" coil steel car, Chattahoochee Bay Railroad (HS) #3519. The increased volume of coiled steel transportation gave rise to a new purpose-built freight car. Previously rolls of coiled-steel had generally traveled in specially equipped gondola cars. In the 1960s a lighter type of car emerged specifically for hauling coils of steel in an integral trough. The car type gained popularity and eventually over 17,000 cars were built. Atlas" model replicates a 42" design with a distinctive fishbelly side sill. Its key features are: Prototypical painting and lettering See-through walks Removable hood Inside floor detail Manufacturer: Atlas. Model Number: 50001521. Scale/Era: N Scale. Model Type: Freight Cars.