Symmetry minute

Shortly before every full hour in central European countries using a clock-face timetable, many trains meet and pass the corresponding train in the other direction.

The Symmetry minute is a significant time point in the clock face timetables used by many public transport operators. At this point in time a train in a clock-face timetable meets its counterpart travelling in the opposite direction on the same line. By keeping this crossing time constant across a network, connecting times between lines are kept consistent in both directions.