The following disclosure relates to a rail car. In one embodiment, a railcar can comprise a span bolster, outer truck assemblies, and a middle truck assembly. The outer truck assemblies can be rotatably mounted to each end of the span bolster. The middle truck assembly can be slidably mounted at a middle portion of said span bolster. In another embodiment, a railcar system can comprise a pair of railcars and a body. The rail cars can comprise a span bolster, outer truck assemblies, and a middle truck assembly. The outer truck assemblies can be rotatably mounted to each end of the span bolster. The middle truck assembly can be slidably mounted at a middle portion of said span bolster. The body can have two ends, each of the ends connected to one of the span bolsters.