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

Railroad companies were able to standardize their timetables in 1883 by adopting a system of standardized time zones. Prior to this, each locality operated on its own time, which was based on the position of the sun. This created confusion and inefficiencies in scheduling trains across different regions. To address this issue, the railroad companies implemented a system of four standard time zones across the continental United States. This system, known as "railroad time," allowed for a more coordinated and efficient scheduling of trains, as it provided a uniform time reference for all locations within each time zone. This change was officially adopted on November 18, 1883, and is often referred to as "The Day of Two Noons" because the time was adjusted at noon on that day.