MONTREAL — CN said it is acquiring more than 2,200 new freight cars in 2012, as well as 1,300 new containers, to support traffic growth and improve customer service. “CN is acquiring new freight cars and containers for a range of markets, including forest products, metals, minerals, coal, iron ore, steel, consumer goods, finished vehicles, and grain,” Jean-Jacques Ruest, executive vice-president and chief marketing officer, said. “These fleet additions will help us grow in line with our customers’ demands and ensure CN has the right mix of modern, productive assets.” CN’s largest rolling stock addition in 2012 is the acquisition