(Reuters) – Major U.S. railroads and unions secured a tentative deal after 20 hours of intense talks brokered by the Biden administration to avert a rail shutdown that could have hit food and fuel supplies nationwide. Shares of Union Pacific Corp and CSX Corp were up about 3% before the bell. Following are some reactions to the tentative deal: U.S. HOUSE SPEAKER NANCY PELOSI “The report of a tentative agreement between railroads represented by labor unions and the National Carriers’ Conference Committee is good news for our nation’s economy, our security and the well-being of the American peop…