CANADIAN NATIONAL RAILWAY CO. $81 (Toronto symbol CNR; Conservative Growth Portfolio, Manufacturing & Industry sector; Shares outstanding: 786.4 million; Market cap: $63.7 billion; Price-to-sales ratio: 5.0; Dividend yield: 1.9%; TSINetwork Rating: Above Average; www.cn.ca) operates Canada’s largest railway. Its network stretches across the country and through the U.S. Midwest to the Gulf of Mexico. The company has agreed to repurchase up to 11.2 million of its shares from a private seller at a discount to the market price. It aims to complete this transaction by September 9, 2016. The move is part of CN’s plan to buy back up to 33.0 million of its common shares, or roughly 5% of the total outstanding, by October 29, 2016. Share buybacks raise earnings per share and other per-share calculations. That gives the remaining shareholders a larger stake in the company. CN Rail is a buy.