The train running history could be used to decide the train you are planning to travel for your journey. For Example: If you are planning to travel between New Delhi to Patna Jn. in winters, you may use the train running history by entering the train number and select the winter season dates for last year and with this you may know the performance of any perticular train for the winter, and in the same way you can repeat this for other trains between your stations and select the best performing train.