the Alliance for Rail Competition believes that the introduction of elements of market-based competition into the railroad marketplace is critical in order to maintain and enhance the national and global competitiveness of the railroads' customers.
I believe that the US railroads and their unions are corrupt and inefficient and this corruption hurts US competitiveness.
From what I read at the link you've posted, it looks like that organization is a strong advocate of what is called an "open access" concept in the railroad industry. Under this idea, the Federal government would basically legislate the railroad industry out of existence as we know it -- and allow any company that wants to operate trains to run on the railroads.