Three Stocks to Consider in the Railroad Business   With rumors
of a possible Berkshire-owned BNSF Railway expansion, let's look
at other major railroad companies with potential for future
partnerships. BNSF operates in the western US. So, we'll look at
one company in Canada, and two East Coast leaders. The rail
companies are: Canadian National Railway (NYSE: CNI), CSX (NYSE:
CSX), and Norfolk Southern (NYSE: NSC).  International market
Canadian National maintains a small economic moat because it's
the largest railway company in Canada, owns a route down the
Mississippi, and is present in most segments. The company is in
the best position to benefit from growing potash demand and
mining in the Yukon. The stock is also undervalued, offering
long-term investors a good chance to make a buck.  With a focus
on efficiency, speed improvement, and fuel efficiency, Canadian
National continues to increase transported volumes. That's in
part why the firm holds the highest operating margin in North
America, and revenues