In this thesis we will construct a new robust crew schedule at NS for extreme winter days. On such days there are often a lot of disruptions and rescheduling of the crew and rolling stock is in such case impossible. Therefore, it is necessary to construct a crew schedule which is easily to reschedule. In the robust crew schedule presented in this thesis, all crew members are commuting between two relief locations on a part of a line, but the rolling stock are assigned to the whole line. But implementing this idea needs about 20% more crew members. So in this thesis we discussed a mathematical model and a heuristic to select the optimal part of the tasks. In these methods we used some different sets of profit of tasks. The results of these methods and profits are compared.