 Initially, trains on the line were served by elevated trains from the IRT Second Avenue Line and the IRT Third Avenue Line.Once the connection to the IRT Lenox Avenue Line opened on July 10, 1905, trains from the newly opened IRT subway ran via the line.The line was originally intended to extend farther north but was changed into a terminal during construction due to protests stating that the trains running over Bronx Park would be bad for animals in the Bronx Zoo.