This case study details the successful implementation of a communications-based train control (CBTC) system on Line 7 of the NYC metro, covering Queens and Manhattan. Since 2017, ALTEN Technology has provided indispensable support for this complex project, ensuring it was completed on time and within budget. Their team of engineers offered comprehensive services, including conducting static and dynamic tests of automatic train control systems, delivering on-site technical and operational support for equipment installation and maintenance, executing precise test procedures, and expertly troubleshooting engineering challenges.