On 28 June 1976, India and Pakistan signed the rail communication agreement to normalize the relations between two nations after signing the Simla Agreement (2 July 1972) a few months after the end of Indo-Pakistani War of 1971, when the bilateral relations had soured after the Indian Army had succeeded in liberating Bangladesh. This agreement forms the basis of running "Samjhauta Express" also the Delhi–Lahore Bus and Srinagar–Muzaffarabad Bus are based on a separate agreement.