Portions of the White Plains Road Line were opened at different times, and they opened once construction finished on a segment, as opposed to waiting for the completion of the entire line. The first segment opened on March 3, 1917, from East 177th Street–East Tremont Avenue to East 219th Street–White Plains Road, providing the Bronx communities of Williamsbridge and Wakefield with access to rapid transit service. Service on the new portion of the line was operated as a four-car shuttle from 177th Street due to the power conditions at the time. Service was extended to East 238th Street on March 31, 1917. The part of the line from the S-curve north of West Farms Square—East Tremont Avenue station to the terminal at 241st Street was built as a part of the Dual Contracts.