A New Approach to Shortest Route Finding in a Railway Network with Two Track Gauges and Gauge Changeovers

Figure 2

The Spanish Iberian and standard gauge railway network (2018) (courtesy of the Fundación de los Ferrocarriles Españoles (Spanish Railways Foundation)). The legend of the map is translated afterwards. First column: standard track gauge (1,435 mm); electrified double track; electrified single track. Second column: Iberian track gauge (1,668 mm); electrified double track; electrified single track; nonelectrified double track; nonelectrified single track. Third column: Dual track gauge sections (1,435–1,668 mm) (they are enumerated afterwards).