(Reuters) -Locomotive engineers at Union Pacific ( UNP ) voted to ratify a new five-year contract with the railroad operator, the BLET-Teamsters union said on Friday.

Under the new contract, nearly 6,000 members represented by the Brotherhood of Locomotive Engineers and Trainmen, a division of the rail conference of the International Brotherhood of Teamsters (IBT), will earn raises of 18.8% over the life of the agreement.

The contract also includes improved health and welfare benefits, the union said.

Last week, the largest U.S. railroad union, SMART-TD, approved Union Pacific's ( UNP ) $85 billion acquisition of Norfolk Southern, helping to advance a deal that had been expected to face resistance from unions and regulators.

The deal will create the nation's first coast-to-coast freight rail operator and reshape the movement of goods from grains to autos across the country.

The two companies are expected to file a formal merger application with the Surface Transportation Board, which oversees rail competition and service, by late October or by January 2026.