 Four Class I railroads want the Surface Transportation Board to pause the implementation of an arbitration program to resolve rail rate disputes involving smaller financial amounts. CSX NASDAQ: CSX, Norfolk Southern NYSE: NSC, Union Pacific NYSE: UNP and the U.S. subsidiaries of Canadian railway CN NYSE: CNI argue that STBs deadline for the Class I railroads to commit to a five-year arbitration program as prescribed in STBs December order is too soon. 