 In 1950, EMD's new plant in London, Ontario, Canada, began production.The plant was operated by the Canadian subsidiary General Motors Diesel (GMD), producing existing EMD as well as unique GMD designs for the Canadian domestic and export markets.EMD's road-switcher locomotives with power and reliability sufficient for mainline use overturned the market for freight locomotives, soon displacing their competitors' road-switchers, then later their own F-series carbody locomotives.