The GE Dash 9-44CW is a 4,400 hp (3,267 kW) diesel locomotive built by GE Transportation Systems of Erie, Pennsylvania. It is also known as the C44-9W or "Dash 9". The design has proved popular with North American railroads. Because of more stringent emissions requirements that came into effect in the United States on January 1, 2005, the Dash 9-44CW has been replaced by the GE ES44DC.