Warren Buffett, whom President Obama likes to cite as a fair-minded billionaire while arguing for higher taxes on the wealthy, stands to benefit from the president’s decision to reject the Keystone XL oil pipeline permit.

Mr. Buffett’s Berkshire Hathaway Inc. owns Burlington Northern Santa Fe LLC, which is among the railroads that would transport oil produced in western Canada if the pipeline isn’t built.

“Whatever people bring to us, we’re ready to haul,” Krista York-Wooley, a spokeswoman for Burlington Northern, a unit of Buffett’s Omaha, Neb.-based Berkshire Hathaway Inc., told Bloomberg News. If Keystone XL “doesn’t happen, we’re here to haul,” she said.

The Obama administration rejected TransCanada’s request for a permit on Jan. 18, saying there was not enough time to review the proposal by Feb. 21, the deadline imposed by congressional Republicans eager to see the pipeline built. The decision came from the State Department, although Mr. Obama said he agreed with it.