Rail is easily susceptible to ice. The Union pacific railroad's two main lines in lowa intersect in the center of the state. In the event a large storm preventing trains' passage through this area,there are a few possibilities. First,freight can be diverted to another mode. Roadways are more expensive and likely will face delays in central lowa anyways. Third,grains can be diverted to the Mississippi River using BNSF rail and trans fered south away from the weather disruption. The graph be low details the delays at a typical lock on the Mississippi.