Berkshire Hathaway reported operating earnings of $12.98 billion for the second quarter, up 16% from $11.16 billion in the prior year period. The increase was driven by strength in multiple segments, with manufacturing, service and retailing earnings jumping 24% to $4.47 billion and Berkshire Hathaway Energy’s profit surging 27% to $891 million. The railroad division BNSF posted a 6% increase to $1.56 billion in earnings. Insurance operations re…