Roy, 72, incidentally is a trained engineer and was part of the pioneering team that created the Calcutta Metro.
"He took a ride in the metro, and was all praises for it. The Governor boarded a train from Central Secretariat Metro Station and travelled all the way up to the Kashmere Gate Metro Station.
"In between, he got down at Lal Quila Metro Station and stepped out to see the design of the structure, as also the bustling Old Delhi the metro line enters into," a senior protocol officer told PTI.
"He then returned through the Violet Line service and got down at Mandi House Metro Station on way to a press interaction at the Metro Bhawan," he said.
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"Though, I am now on in a different profession, but deep within still a 'metro man'. I enjoyed the ride very much.
"Delhi Metro is something that we all are very proud of. I have seen metros in foreign countries too, but this is one of the best," Roy was quoted as saying by the senior officer.
"The Governor arrived here Sunday evening and is expected to meet some senior government officials in Delhi. On June 7, he is scheduled to go to Chandigarh, after which he will return home via Delhi," he said.
Violet Line of the DMRC network stretched for about 36 km from ITO metro station to Escorts Mujesar station, up until late last month, when the 5.17-km-long corridor was launched from ITO station to Kashmere Gate metro station.