As part of the contract, ARM will review the existing conditions and develop and execute a rail grinding program to remove corrugation, surface cracking, and gradually restore the design rail profile on open and tunnel mainline track, including the at-grade embedded track sections in the downtown area, on the Blue and Red Lines across the 120 route-km (60km of double track) system. ARM will measure and analyse rail roughness, corrugation, wear and surface defects on the system. From that, it will develop and supervise the grinding program through onsite field management to optimise track time and metal removal rates for the grinding programme. The plan is to address the Blue and Red Lines alternately each year.