New Delhi, April 13 -- The Delhi Metro Rail Corporation (DMRC) has undertaken a comprehensive mid-life refurbishment (retrofit) initiative for its Blue Line trains to enhance passenger safety, comfort, and overall travel experience. Under this initiative, the oldest Rolling Stock (RS-1) trains are being upgraded with modern technology and improved facilities to ensure they remain reliable and meet current standards. As part of its mid-life refurbishment programme, DMRC is refurbishing 70 trains of Red and Blue lines in a phased manner. In the first phase, 12 trains have already been upgraded. In the second phase, 18 trains have been refurbished, and work on another 9 trains will begin soon, followed by work on the remaining 9 trains. In t...