This project involves the renewal of the existing Siemens Relay Interlocking and Alstom CBI with General Electric VHLC interlocking for 38 stations in the Rotterdam RET Metro Project. Our activities for this project include signalling plans, safe braking calculations, ATP code charts, drafting, location hardware design and verification, location system design and verification, interlocking software preparation and verification, software simulation and delivery of as-built documentation.