In a written reply, Union Minister of State for Urban Development Babul Supriyo said during peak hours long queues for security check are observed at a few terminals or interchange stations of Delhi metro.
"DMRC has informed that they have provided additional Door Frame Metal Detector at 50 stations," the minister said.
Responding to another query on solar energy, he said DMRC has installed roof top solar photo voltaic plants at 20 of its stations to enhance consumption of green energy.
He said solar power generated by these plants is utilised for elevators/escalators and other auxiliary loads such as lighting loads and air conditioning.
Other metro companies at Kochi, Nagpur, Mumbai, Chennai and Banglore also plan to harness solar energy, the minister added.
