New Delhi: Train services will be briefly regulated in the early hours of Sunday on Blue Line as Delhi Metro will undertake scheduled maintenance activity between Supreme Court and Indraprastha Metro stations.The first train will depart at 6.05 am from Vaishali towards Dwarka Sector-21; at 6.21 am from Laxmi Nagar towards Dwarka Sector-21; and at 5.50 am from Yamuna Bank towards Dwarka Sector-21. However, there will be no change in the first train timings from Dwarka Sector-21.