New Delhi, Nov 29 (PTI) In a first-ever mid-life overhaul of its old rolling stock, the Delhi Metro Rail Corporation (DMRC) on Monday unveiled its first refurbished train which was introduced into service 14 years ago as part of its Phase-I network." /> New Delhi, Nov 29 (PTI) In a first-ever mid-life overhaul of its old rolling stock, the Delhi Metro Rail Corporation (DMRC) on Monday unveiled its first refurbished train which was introduced into service 14 years ago as part of its Phase-I network." />