The saving energy with train operation is more important than before from the view points of the global environment. However the energy saving design on the traction equipments sometimes has a trade off relation against the down sized and lighter weight traction equipments. In this paper, an optimizing method of the generic algorithm is applied to the numerical simulation to calculate the consuming energy, the running time, the loss of traction motors and inverters. The results show the trade off relation between the total consumed energy, the running time, the loss of traction motors and inverters. The proposed method will contribute to design efficiently the electrical traction equipments considering the energy consumption.