Greenhouse Under Platform Nine

After midnight the station exhales iron and rain. I unlock the service door where fluorescents hum like bees. Trains pass above, a weather of thunder and sparks, and the concrete sweats a cold, mineral dawn.

In trays of broken ticket stubs I seed small ferns. Their fists uncurl toward lamps wired to a timer's pulse. Rust flakes drift down like cinnamon from girders, and every root learns the map of pipes by touch.

At three, a violin busker packs his case and leaves me silence. I water the moss walls until they darken into forests. Drops gather, then fall, a patient metronome, counting the heartbeats of a city that never lies down.

By first light commuters descend with coffee and bright screens. They do not see the green breathing just beyond the tiles. But when the doors open, a wet-earth wind slips through, and for one stop everyone looks up, listening.