The Burlington Northern Santa Fe railroad plans to invest $3.9 billion in upgrades to its network this year. The railroad said Wednesday that its capital spending plan is $400 million bigger than its 2011 budget of $3.5 billion. Overall, the nation’s major freight railroads, which include BNSF, plan to spend about $13 billion this year, up from 2011′s $12 billion, as the economy improves. Read More