New Delhi: Mangu Singh, Delhi Metro's Director who oversaw the construction of the high-speed Airport Metro Express, was on Wednesday formally appointed as the organisation's new Managing Director succeeding E Sreedharan who retires on December 31 after a 16-year tenure.

56-year-old Singh, a civil engineer from Roorkee University, was Sreedharan's choice to step into his shoes as the 'Metro Man' wanted an engineer of repute to take over the charge after him.

Singh is an Indian Railways Service of Engineers (IRSE) officer of the 1981 batch and worked with Sreedharan in the Kolkata Metro project. He has been associated with the Delhi Metro since its inception.

Singh, the key man behind the Airport Metro Express, was selected by a three-member panel consisting of Union Urban Development Secretary Sudhir Krishna, Delhi Chief Secretary P K Tripathi and Sreedharan.

Sreedharan will call it a day on December 31 after a 16-year tenure that saw him revolutionising the way Delhi travelled.

Sources said Singh was given the letter of appointment on Wednesday and will take over as Delhi Metro Managing Director E Sreedharan on January 1, 2012.

Singh is also in-charge of the Delhi Metro's Phase-III that envisages bringing another 103 km of the capital under the Metro network.

The engineer is also in-charge for consultancy works undertaken by Delhi Metro for planning Metro systems in cities like Mumbai, Chennai, Hyderabad, Kolkata, Ahmedabad and Kochi.