The Delhi Metro says the brake system was not tested and it appears to be a case of human error. A high-level inquiry has been ordered.
“A trial train was moved from the workshop without testing the brake system as a result of which, while the train was moving up the ramp for washing, it rolled back and hit the adjacent boundary wall,” the Delhi Metro said in a statement.
PM Modi is scheduled to inaugurate the Kalkaji Mandir-Botanical Garden stretch of the Magenta line on December 25. The Delhi Metro says the inauguration will go ahead as scheduled.
The Magenta Line is to run between Janakpuri in Delhi and neighbouring Noida.
The 12.64-km section, which will reduce travel time between Noida and south Delhi, was granted safety approval by the Commissioner for Metro Rail Safety (CMRS) last month.
The new section will connect south Delhi to Noida and save commuters at least 45 minutes. The 52-minute ride will be reduced to just 19 minutes.
Once the entire corridor from Botanical Garden till Janakpuri West (38.23 km) is opened, commuters from Noida will be able to go to Gurgaon by changing trains at Hauz Khas.
The construction work of two parallel tunnels on this corridor was completed simultaneously. This first happened in the Toronto-York Spadina subway extension in 2002.
According to metro officials, the construction of the tunnels was a major engineering challenge as they passed below thickly populated residential as well as commercial areas consisting of schools, temples and hospitals.
The Magenta line will have automated platform screen doors at every station, just like jubilee line of the London tube.