Which best explains how railroad companies were able to standardize their timetables in 1883?

by combining into a single railway company

by working together voluntarily

by unionizing their labor forces

by complying with federal legislation

By working together voluntarily, the railroad companies were able to standardize their timetables in 1883. The correct option among all the options that are given in the question is the second option. The creation of time tables made the railway system more efficient and people could know the exact time at which their goods or the people travelling will reach their destination.