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Verkehrswesen für Deutschland (Research Association for Roads and Traffic for Germany) recommends minute 58, so a four-minute minimum connecting time results in a departure at minute 0. Meanwhile, most railways in Central Europe and a number of other transport operators have established the symmetry minute 58½, for a three-minute hold time before a departure at minute 0. Shorter cycles have additional symmetry minutes, shifted by half the cycle time. So an hourly cycle has symmetries at minutes 28½ and 58½, a 30-minute cycle has symmetries at minutes 13½, 28½, 43½ and 58½, and so on.
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At the symmetry time, the timetable is mirrored in both directions. At the ends of the line, the center of the turnaround time coincides with the symmetry minute. The distance between two consecutive symmetry times is equal to half the cycle time, so on an hourly schedule, opposite trains on the same
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In principle, a train-encounter can be set at any time. However, at the transition between two networks or lines, it is expedient to set uniform symmetry minutes, to create a symmetrical connection relation. For the long-distance cycle systems of ÖBB and SBB, the
Forschungsgesellschaft für Straßen-
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operators. At this point in the cycle, a train in a clock-face timetable meets its counterpart travelling in the opposite direction on the same line. If this crossing time is constant across a network, connecting times between lines are kept consistent in both directions.
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The following table shows the departure times in opposite directions for an hourly cycle, using the 58½ symmetry minute (the most common in
Central Europe). The other departure times for shorter cycles can be calculated from it. The last line gives the meeting times.
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Content in this edit is translated from the existing German
Knowledge article at ]; see its history for attribution.
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line cross every 30 minutes. On a two-hour cycle, there is a symmetry time every hour.
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Shortly before every full hour in central
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A rail net on an hourly cycle with symmetry at minute 0
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