52 foot Center-Depressed Flat-Car with BOILER - N Scale. Center Depressed Flat Cars are sometimes referred to as Heavy Capacity Flat Cars. These cars are equipped with an extra axle to support additional weight and the Center Depressed design allows the car to handle Excess-height loads. Bachmann’s Center Depressed Flat Cars come with prototypical 3 axle trucks. Each car is fully assembled and features; Highly Detailed Painted Bodies with Precision Graphics, Blackened Machined Metal Wheels with RP 25 Contours, Magnetically Operated E-Z Mate® Couplers, Non-magnetic Blackened Brass Axles with Needle-point Bearings, Celcon Trucks, and Added Weight for Optimum Tracking Performance.