"The president is optimistic the report will provide a good framework for successful negotiations between the parties over the next 30 days," a White House official said, adding the recommendations were delivered to the White House and the parties.

Talks between major freight railroads, including Union Pacific, Berkshire Hathaway-owned BNSF and CSX, and unions representing 115,000 workers have dragged out for more than two years.

(Reporting by David Shepardson and Lisa Baertlein, Editing by Chris Reese)