According to a Delhi Metro Rail Corporation official, in the survey, DMRC has secured second position in "train cleanliness and comfort".
The survey was conducted by RTSC, which manages the 'NOVA' and 'CoMET' benchmarking groups of Metro networks.
"The survey was conducted as per international standards EN 13816 (an European survey system used widely to assess the performance of the public transportation systems in Europe) and was controlled directly by RTSC through an internet link on DMRC's website- www.Delhimetrorail.Com," official statement issued by DMRC states.
It also conducted the third edition of its in-house "Customer Satisfaction Survey" (CSS) from August 24 to September 1, 2015 and covered 96,466 respondents.
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"The survey was conducted at the top 50 Metro stations of the network and some responses were also collected from inside the trains. Like the international survey, this survey was also done as per international standards EN 13816," the official said.
CSS included various crucial aspects of Metro operations such as availability and accessibility, new facilities offered to customers, information, quality of service, customer services, outside Metro area, comfort and view on fare revision, security and safety, it added.
DMRC will take up these issues with the civic authorities and work towards necessary improvement, it added.