At midday: TSX flat as global stocks retreat

TSX was flat on Wednesday as gains in Canadian National Railway's shares boosted industrial stocks and steadying gold prices lifted precious metals miners. At 11:26 a.m. ET, the Toronto Stock Exchange's S&P/TSX Composite Index rose 3.34 points, or 0.02 per cent, to 15,555.40. CN Rail rose 0.4 per …