The subway maintenance worker slowly moves the handheld detector along the steel rail while shining her flashlight directly ahead. The detector suddenly reacts: its indicator begins flashing rapidly. Her cheerful expression immediately becomes focused. She stops, crouches beside the rail and brings the flashlight closer. She spots a loose metal fastening beside the track, reaches into her tool belt, takes a small wrench and quickly tightens it. She checks the detector over the same spot again — the flashing stops. She smiles with satisfaction, rises and points her flashlight farther down the dark tunnel, ready to continue. Water drips from overhead pipes, tiny puddles ripple beside the tracks and distant tunnel lights flicker softly. Camera tracks slightly forward alongside her, keeping the endless rails visible behind. Clear mini-story: inspection → detector warning → problem found → quick repair → successful recheck. Preserve her exact face, tools, rails and tunnel. No train appearin
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