National Capital Region Transport Corporation (NCRTC) has named India's first semi-high speed regional rail services as 'RAPIDX'. The Regional Rapid Transit System (RRTS) will help connect urban nodes of the national capital region (NCR). As per the NCRTC, the 'X' signifies next-generation technology and new-age mobility solution. "It also represents youth, optimism and energy," NCRTC said.