HYDERABAD: In view of the ongoing integration of the new route-relay interlocking system at Tuglakabad station near New Delhi, four trains on May 8 and 10 have been cancelled. Train 12721 Hyderabad-Hazrat Nizamuddin Superfast Dakshin Express departing from Hyderabad on May 8, and its return train 12722 from Hazrat Nizamuddin on May 10 are cancelled.