ScotRail will permanently abolish peak fares across its network from September 1, meaning passengers will pay the same fare regardless of travel time.
This change will significantly reduce costs for commuters, with the Edinburgh to Glasgow 'anytime' day return fare dropping by almost half, from £32.60 to £16.80.
The decision follows a year-long pilot scheme, subsidised by the Scottish government, which found only a limited increase in passenger numbers and did not achieve its aim of a significant shift from car to rail.
Despite the pilot's findings that it primarily benefited existing passengers and higher-income individuals, the Scottish government hopes the permanent removal will encourage greater use of rail travel.
The move has drawn criticism for its economic rationale, especially given government budget pressures, and the ending of some 'super off-peak' tickets may lead to fare increases on other routes.