 Currently, California Northern owns twelve locomotives, as several have been sold to other railroad companies, including Union Pacific, Fillmore and Western Railway, Trans Canada Switching, Hudson Bay, Mosaic, Twin Mountain, and San Joaquin Valley Railroad.In 2009 the railroad began a program to replace their existing fleet with new fuel-efficient locomotives, known as "gensets", or 3GS21B-DE, built by National Railway Equipment.80 percent of the funding for the purchase of these new locomotives comes from a grant from the Carl Moyer Memorial Air Quality Standards Attainment Program at the Bay Area Air Quality Management District.