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

Figure 14

3D plot of the Valencia–Canfranc best route. The part of the route where the train is set to standard gauge is on the upper plane (in red) and the part where it is set to Iberian gauge is on the lower plane (in green). The long vertical connection represents the pass through a gauge changeover (in green).