A change to a bus/train route — i.e., altering the route of public transportation; the change itself.
台風の影響で、市内バスが一部路線変更になった。
Due to the typhoon, some city bus routes were changed.
工事のため、当駅発の路線変更が行われます。案内板を確認してください。
Because of construction, departures from this station will have route changes. Please check the information boards.
A change of policy; a reversal or shift in the course of action (e.g., by a company or political party).
経営悪化を受け、会社は事業戦略の大きな路線変更を発表した。
In response to worsening business conditions, the company announced a major change in business strategy.
選挙後、党の路線変更に反発する声が上がった。
After the election, voices rose in opposition to the party's change of course.