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. The city government took over the IRT's operations on June 12, 1940.
The service on the newly constructed part of the line began with a four-car shuttle from 177th Street due to the electrical issues present at the time. The city government assumed control of the IRT's operations on June 12, 1940.