Abstract
A netgraph is a graphical representation of a periodic timetable concept for given spatial or modal scope. It adds a third dimension to the network plan – time. Despite no strictly prescribed rules, a common practice notation has been settled over time. The authors propose an extension of a netgraph for planning of periodic railway capacity and operation, including related notation rules.
Highlights
A netgraph, called interval graphic, is a graphical representation of a periodic timetable concept of public transport lines in a designated geographical or political territory, for a transport segment or a production unit
The netgraph adds a third dimension to the two-dimensional network plan – time schedule
It is useful to distinguish the nodes where the train calls with dots in the colour of the respective line at intersections of the edge and node borders
Summary
A netgraph, called interval graphic, is a graphical representation of a periodic (interval) timetable concept of public transport lines in a designated geographical or political territory, for a transport segment or a production unit. It displays at first traffic and transport coherence of the individual lines in transfer nodes and their service function on the territory (number of stops). The authors propose an extension of a netgraph for planning of periodic railway capacity and operation For such purpose, it is necessary to establish rules for notation of passing through defined station at a certain time, for alternative routing of a train path, for a train path for one direction only, and for crossing of the opposite trains on a single-track line. A proposal of related rules is presented and discussed
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