CANADA STOCKS-Canadian National, energy shares spur TSX to record high

(Adds comment from portfolio manager, details on market activity, updates prices) By Alastair Sharp TORONTO, July 22 (Reuters) - Canadian National Railway and energy shares pushed Canada's main stock index higher on Tuesday, topping the record high it hit last week, as tensions eased in Ukraine. CN Rail was the index's biggest positive force, up 1.6 percent at C$74.14, after the country's biggest railway reported record volumes and lifted forecasts after the bell on Monday. Amo