You've been entrusted with managing a large$-$scale infrastructure project aimed at revitalizing a city's transportation system. The project entails constructing a modern subway network to alleviate traffic congestion, reduce carbon emissions, and enhance public mobility. The subway system will comprise multiple lines connecting key residential, commercial, and industrial areas, with strategically located stations equipped with amenities such as ticketing kiosks, waiting areas, and accessibility features. The project has garnered significant public and governmental support, with a budget of $$2$ billion allocated for design, construction, and implementation. The timeline spans five years, encompassing phases for feasibility studies, environmental assessments, engineering design, construction, testing, and commissioning.