Table 4: Definition of some notations.

NotationDefinition

The MILP problem
The minimum upper bound of optimal performance of train operation
The optimal solution vector of optimal performance index for train operation
The object table of recording all LP subproblems that need to be solved
The optimal performance of the current relaxed LP problem
The optimal solution vector of the relaxed LP subproblem
Number of LP subproblems that have been solved
The maximum number of LP problems