Increasing Robustness by Reallocating the Margins in the Timetable

Table 1

Table of Notations.

Symbol	Description
T	Train index
S	Segment index
T	Set of trains
S	Set of segments
	Train route
	Activities of CPM network
	Total number of Activities
	Path index
	Total number of Paths
	Length of path p
	Length of critical path
	Total margin in the timetable
	Number of times an activity appears on total paths P
	Sum of length of path on which activity appeared
	Average of length of path on which activity appeared
	Process order within a path
	Processing time of activity at path p
	Margin time of activity at path p
	Start time of activity
	End time of activity
	Start time of a train t at origin
	Planned start time of a train t at origin
	Minimum dwell time for activity
	Delay of activity
	Disturbance occurred at
	random processing times for activities due to the disturbances
	Safety headway before an activity
	Safety headway after an activity