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

Figure 5

Different types of track discontinuities found along the line (Imagery: Google Street View): (a) bridge, (b) road underpass, (c) culvert, (d) train station, (e) turnout, (f) rail joint, and (g) unauthorized pedestrian crossing.

(a)

(b)

(c)

(d)

(e)

(f)

(g)