Repair, remove, or replace defective components such as wheels, safety appliances, truck and brake equipment, couplers, yokes, draft gears, and air brake valves, weld broken parts or secure new parts. Norfolk Southern also has the most extensive intermodal network in the eastern U.S., serving a majority of the country's population and manufacturing base, with connections to every major container port on the Atlantic coast as well as the Gulf of Mexico and Great Lakes.