Time zones, how the railroad industry changed our perception of time
Before the advent of the railroad transportation systems, people set their clocks according to the position of the sun. Each city had its own local time. The clocks in a city located farther west could be several minutes behind. This difference didn't cause any inconvenience when slow means of transportation were used. Journeys on horseback or in a carriage took so long that small differences in time did not matter.
