Four years after the merger of the Illinois Central Railroad into the Canadian National system, we travel a segment of the Mainline of Mid America to take a look at day to day operations. In this program, we start at Centralia, Illinois, and move south along the Centralia Subdivision. Along the way, we stop at every town until we reach Wetaug, Illinois. Wetaug is the last passing siding north of Cairo, Illinois, the very southern tip of the state.