 In late 1965 EMD built their first twenty-cylinder engine, a turbocharged V20 for the EMD SD45.The final variant of the sixteen cylinder 645 (the 16-645F) produced .In 1972, EMD introduced modular control systems with the "Dash-2" line; the EMD SD40-2 became one of the most successful diesel locomotive designs in history, both in terms of sales and service longevity.