Smartphone’s Sensing Capabilities for On-Board Railway Track Monitoring: Structural Performance and Geometrical Degradation Assessment

Figure 7

Identification of the regions that negatively affect the track performance, analysed in terms of amplitude and length of the defects: (i) regions with higher risk of derailment (lower train running safety) in red, (ii) regions with increasing track degradation rates in black, and (iii) region with lower passenger ride comfort in blue (adapted from [25]).