Sushil Singh is an officer in the Indian Railway Service of Mechanical Engineering (IRSME) from the 1993 batch. The Indian Railways is home to group 'A' central engineering services. He takes over for S. K. Mehta, who left the position in April following a five-year tenure. Singh's appointment is effective until January 31, 2027, or until the Appointments Committee of the Cabinet (ACC) issues additional directives.

India's second-largest state-owned commercial port by volume handled is managed by the Deendayal Port Authority.

As a joint secretary in the Ministry, Singh oversaw public-private partnerships (PPP) at the 12 major government-owned ports, as well as port modernization, automation, green port and smart port programmes, and mechanisation of port infrastructure. In order to increase the ease of doing business and the supply chain's visibility, he was also involved in the implementation of technological and policy initiatives.