Tunnel Lining:, Thick concrete or steel rings that support the ground and stop soil or water from leaking in., Rail Tracks:, Steel rails fixed to sleepers or a concrete base to guide the train safely through the tunnel., Overhead Power System:, A cable above the train or an electrified rail that supplies electricity to power the train., Ventilation Shafts:, Large ducts and fans that bring in fresh air and remove heat, dust, and smoke., Drainage System:, Channels under the track that collect and carry away water to keep the tunnel dry., Fire Suppression System:, Sprinklers and sensors that detect and control fires quickly to protect passengers., Emergency Exits:, Connecting tunnels or doors that link to other tunnels or safe exits., Signalling System:, Sensors and lights that tell the train when to stop, go, or slow down., CCTV Cameras:, Cameras placed throughout tunnels and stations for safety monitoring., Control Centre:, The main hub where operators control signals, lights, and emergency systems..
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