Subway tunnel construction in New York City involves using special equipment and methods to deal with different tunnel conditions. Various types of tunnels are excavated using a mix of proven and new equipment. Support structures like roof bolts, timber, and steel are used in the tunnels. Rubber-tired hauling equipment is used for flexibility, while crawler-mounted equipment is chosen for loading. Concrete equipment is adapted for different placing needs. Rock fall prevention is crucial during excavation, and concrete is used to support the tunnel. Blasting is limited to protect existing structures.