Abstract
The aim of this paper is categorization of various irregularities in Integrated Periodic Timetable (IPT), according to their impact on passengers. For instance, minor deviations in departure minutes can cause almost zero impact, provided that all periodic transfer connections are ensured for each service. On the other hand, skipping of a periodic service at off-peak hours can considerably lengthen some passenger transport chains. Chosen categories of irregularities are illustrated by examples from 2017/2018 Czech railway timetable.
Highlights
Irregularities with network impactOne regional public service orderer, Liberec Region (Liberecký kraj), via its subsidiary KORID LK and in cooperation with neighbouring Central Bohemia Region (Středočeský kraj), has patched a pair of skipped fast train services of the R22 line [4] around noon by a pair of regional train services 6022 and 6009 between Rumburk and Mladá Boleslav (railway lines 081 and 080)
Contrary to periodic timetable, as used, for instance, in urban public transport, Integrated Periodic Timetable (IPT) requires unified service period and unified symmetry time among all involved public transport lines
Unified timetable symmetry is necessary for symmetrical transfer connections within both directions
Summary
One regional public service orderer, Liberec Region (Liberecký kraj), via its subsidiary KORID LK and in cooperation with neighbouring Central Bohemia Region (Středočeský kraj), has patched a pair of skipped fast train services of the R22 line [4] around noon by a pair of regional train services 6022 and 6009 between Rumburk and Mladá Boleslav (railway lines 081 and 080). It sounds like irony of fate, since both fast and regional trains on this corridor are operated by stateowned carrier Czech Railways (České dráhy). The pair of 633 and 634 fast trains serve the station Písek město on workdays, but without Fridays, since fast train to and from Prague runs on Fridays from the station Písek through another line – see timetables of railway lines 200 and 190 [9]
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