Optimal Inspection Scheduling Model for Monitoring Railway Track Grids

Figure 5

Map of time-location grids based on various constraints of track inspection activities. (a) Time constraint between activities. (b) Fixed duration constraint. (c) Spatial constraint between activities. (d) Rate constraint of activities. (e) Resource constraint. (f) Continuity constraint.

(a)

(b)

(c)

(d)

(e)

(f)