BNSF Railway Co., the carrier owned by Warren Buffett’s Berkshire Hathaway Inc., is blocking some shippers from adding tank cars to its system in a bid to prevent a worsening of the gridlock that sparked regulators’ ire.

A controversial BNSF Railway Co. labor contract proposal that would have cut some crews to one person from two has been rejected by workers who voted on the proposal, the union and the railroad confirmed.

A controversial BNSF Railway Co. labor contract proposal that would eventually cut some crews to one person from two is being outlined to union members this month ahead of a ratification vote.

BNSF Railway said it will spend $5 billion on improvements to its rail network in 2014, $1 billion more than last year.

Berkshire Hathaway Inc., parent company of BNSF Railway, has promoted Carl Ice to CEO of the freight railroad, replacing Matthew Rose, the company said.

BNSF Railway, the carrier owned by investor Warren Buffett’s Berkshire Hathaway Inc., posted 8% higher third-quarter net income of $1.11 billion, from $1.03 billion a year ago, according to a regulatory filing.