India and Pakistan on Sunday conducted a successful trial run of a bus service linking the Indian city of Amritsar to the Pakistani city of Lahore as part of their cautious peace process. The Indian bus, painted with the flags of both countries, left the Sikh holy town of Amritsar in Indian Punjab for Lahore in Pakistani Punjab 60 km (37 miles) to the west. As the golden-coloured bus with Indian officials on board crossed the border point at Wagah, a Pakistani band greeted the vehicle, a witness said. "I am so happy that I cannot explain it to you," bus driver Amreek Singh told NDTV 24/7 news television. The bus later arrived in Lahore, Reuters reported. "The limited kind of opening between India and Pakistan over the past two years has demonstrated that there is a huge pent-up demand for interaction and business development," Indian Foreign Secretary Shyam Saran told a seminar in New Delhi on Saturday.