Answer:
Operators of the new railroad lines
Created the time zone as already proposed by sir sandford Fleming
Step-by-step explanation:
Scottish-born Canadian Sir Sandford Fleming proposed a worldwide system of time zones in 1879, so sir Sanford Fleming proposed it first.
But then,
Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals.
Four standard time zones for the continental United States were introduced on November 18, 1883.