Mina Kimes talked about her Fortune piece on U.S. freight rail, and she responded to telephone calls and electronic communications. Shippers say railroad have a cartel, with four companies controlling 90 percent of the industry's business while the railroads claim they are a free market success story. Topics in this interview included how those four companies gained such a large market share and the resulting effect on the industry.

This program was part of a "Washington Journal" series highlighting recent magazine articles. This week's article is titled, "Showdown on the Railroad."

Ms. Kimes participated from New York City.