The boy put his hand over the notebook, and my father’s voice came again through the door, muffled now, as if its speaker had turned away. My older self lifted their palm from the wood, leaving a faint red print, but waited when the conductor raised his watch. “There was only one child on that train,” he said. The boy moved closer to my father, who asked the voice what it could see. “The green seats,” it answered, “and my coat, where I left it.” The coat hung from the boy’s arm, dripping onto the passage floor, and my father took it gently from him before reaching for the latch.

When the door opened, the carriage was there, its lamps burning low above the empty seats. The torn page and my ticket had both vanished, but on the nearest cushion lay the broken tip of the pencil, beside a small wet footprint. My father stepped inside and called his own name, and the answer came from farther down the carriage, beyond a partition of rippled glass. The conductor caught the door before it could close behind him, though he made no move to follow. I went in after my father, and the boy came too, carrying the notebook under his coat; through the glass we could make out a child seated with his knees drawn up, his face blurred by the pattern. When my father slid the partition aside, there was no one on the seat, only a folded square of paper and a little hollow in the green upholstery.

The boy took out the torn page and unfolded it beside the square, and I saw at last what my father had written beneath his request: *I should have come back for you.* The square on the seat bore the same words, but in the thin hand that had put my father’s name on the ticket, and underneath them was a second sentence: *You still can.* The carriage gave a small lurch, and through the window the platform began to slide past, though the conductor remained at the door with one foot on the shop floor. My father gathered the boy against him and turned toward the opening, but the space between the carriage and the threshold had widened to a strip of rain-dark track. My older self seized my hand from the other side and pulled me across; my father followed, lifting the boy, whose coat caught for an instant on the brass rail before tearing free. The conductor let go of the door, and it shut without a sound as the carriage slipped away into the rain.

Back in the little room, the woman spread the boy’s coat near the lamp while my mother wrapped a cloth around my older self’s injured hand. The boy placed both pieces of paper on the table, then sat beside my father and carefully fitted the broken pencil together again. The conductor stood at the shop window with his watch closed, looking toward the far end of the platform, where the second carriage had disappeared. “Who wrote that?” I asked him, pointing to the square, but he only looked at my older self. They had gone pale, and when my mother released their hand they reached into their coat pocket and drew out a ticket, dry and unfolded, with my name on it alone. Before any of us could touch it, something struck the wall beneath the counter: three measured taps, followed by my father’s young voice asking, very softly, whether he could come out now.

My mother went into the little room first, with the girl close behind her, and found the chair pulled away from the table. The woman was standing against the wall, the smallest mitten still in her hand; she said she had not touched the chair, though she had heard it move. Her ticket lay where the older man had left it, but a damp square of paper now rested on the saucer beside it. My father took the notebook from the boy and held its torn edge against the square. The fibers matched, and when he turned the page toward the lamp we saw a single sentence written in the boy’s cramped hand: *Please let me come home.* The woman read it over his shoulder, then looked at the boy as if she had only just noticed how wet his sleeves were.

The conductor appeared in the doorway behind us, rubbing the clouded face of his watch with the edge of his coat. He said the page belonged in the carriage, and reached past my mother to take it, but the girl caught his hand in both of hers. Her mittens left dark marks on his skin; he stood very still until she let go, then drew his hand back against his chest. “Whose home?” the older man asked the boy, who had followed us as far as the threshold. The boy glanced at my father and then at the floor beneath the counter, where he had waited, and said he had not known what else to write. My father laid the notebook on the table and asked whether he could write something more, but the pencil had been left in the carriage with the ticket.

My older self came in from the passage, bringing a smell of rain and warm upholstery, and put the pencil beside the saucer. A red mark crossed their palm where they had caught it in the closing door, and I remembered the hand I had seen reflected in the water. The boy picked it up, but my father sat down in the chair before he could begin and held out the torn page. “I left your coat there,” he said. “I thought I could fetch it after I’d taken her home.” The boy came close enough to see the writing as my father added a few words beneath his own, pressing so hard that the point broke again. When he finished, he gave the page back without showing it to the conductor, and the boy folded it carefully into the notebook.

Outside, the wheels had stopped, though rain still streamed past the shop window and the second carriage remained at the far end of the platform. The conductor opened his watch once more; this time he studied its face, then lifted his head toward the passage. From behind the closed door came a knocking, three measured taps, and the girl slipped her hand into the woman’s. My older self went to the door but did not open it, resting their injured palm against the wood while the knocking came again. “Is that you?” my father called, and the boy beside him raised his face at the same moment as the voice answered from the other side. It was my father’s voice, younger than I had ever heard it, asking why we had left him on the train.

The door behind my older self opened farther, and the light fell across a row of empty seats upholstered in green. A little water ran over the threshold, although the boards of the passage were dry, and in it I could see the reflection of a hand gripping the carriage rail. My older self stepped aside, keeping the folded ticket out of the conductor’s reach, and the boy beside my father gave a small cry. On the nearest seat lay a blue coat with one sleeve turned inside out, just as his was. “I came back for him,” my older self said, and the boy pressed the broken graphite into his palm until a dark line appeared between his fingers.

My father asked why the boy’s coat was in the carriage when the boy had been waiting beneath our floor. “Because you left it there,” my older self answered, looking at him rather than at the child. He touched the boy’s shoulder, and the boy flinched before allowing the hand to rest there. The conductor opened his watch again, but its face had clouded, and he rubbed it with his thumb without making it clear. From the little room the woman rose with the smallest mitten in her hand, leaving her ticket on the table beside the saucer. “If he goes back for the coat,” she asked, “does he have to stay?” The conductor did not answer her, and my older self held the ticket closer to the lamp.

There were now two names on it, mine and my father’s, the second written in a thin, uneven hand. My father reached for the paper, but the boy caught his sleeve and said he did not want the coat; he only wanted the pencil, which my mother still held. She gave it to him, and he went into the passage before any of us could stop him, walking past my older self to the carriage door. The conductor followed, his watch swinging against his waistcoat, and I ran after them, close enough to smell the wet wool of the coat as the boy lifted it from the seat. Underneath it was a notebook, swollen at the edges, with a torn page caught in its binding. The boy fitted his broken piece of graphite to the pencil and wrote something on the page, shielding it from us with his arm.

The bell rang so sharply that I put my hands over my ears, and when I lowered them the conductor had caught the boy by the wrist. My father pulled him free, while my older self laid the ticket on the seat and held the carriage door open against a sudden gust of damp air. The boy tucked the notebook under his coat and stumbled back into the passage with us; behind him, the door closed softly, leaving the ticket inside. We stood listening as the wheels began to move, though through the shop window the second carriage still appeared to be standing at the far end of the platform. My father knelt and asked the boy what he had written, but the page had torn loose during the struggle and remained on the carriage seat. The boy opened the notebook to show us the ragged edge, and from the other side of the wall came the slow scrape of a chair being drawn up to a table.

I put my ear to the wall where the boy had been listening, and at first the plaster felt so cold that I pulled away. Then, beneath the hiss of rain, I heard my name spoken once, followed by a quick shuffling sound. My father came to stand behind me, but when he called out, the voice did not answer him. The boy traced the seam of the wall with the broken graphite, leaving a thin black line that bent around the corner and ran down behind the counter. We moved the counter together, its feet dragging through the wet dust, until a second narrow door appeared beneath the warped board we had lifted. There was no keyhole in it, only a shallow slot at the height of my hand.

The conductor stooped to look, and I saw the reflection of the slot in his watch before he snapped it shut. “The ticket,” he said, holding out his hand again. I kept it, and my mother crouched beside me, her younger self leaning against her shoulder with the two blue mittens pressed together. From the little room, the woman said that the slot had once been used for letters; she had meant to open them, she added, but there had always been another train to meet. The older man unfolded her ticket again and laid it beside the mitten in her lap, though she did not look down at it. When the voice behind the door called my name a second time, my father reached for the pencil, then stopped and let me take it from him.

I slid my ticket halfway into the slot, leaving enough outside to hold, and felt a gentle pull from the other side. My father caught my wrist, but I could see his younger self watching us, the graphite still pinched between his fingers, and after a moment my father loosened his grip. The ticket slipped away; a latch lifted, and the narrow door opened onto a passage lit by a single lamp. A person stood at the far end with their back to us, wearing my coat, its hem dark with rain. I called out, and they turned just enough for me to see my own face, older than it was now, with a pale mark across one cheek. “Don’t give him the ticket,” they said, and raised their hand to show me the damp square of paper.

The conductor stepped forward, but my mother put herself between him and the door, keeping one arm around the child. “You told us the carriage would take her to the address,” she said, and he answered that he had told us only where it was going. Outside, the far bell rang twice, close enough now to make the tins on the floor tremble, and the older man went to the shop door to look. My father asked the figure in the passage how they had come there, but they were watching the conductor, folding the ticket small between their fingers. “I took the first carriage,” they said, “and I came back for the one who didn’t.” Behind them, another door began to open, letting in a strip of pale carriage light.

The second carriage stood so far down the platform that its wheels were lost in the rain, but the light in its windows reached us in pale strips across the boards. My father held my ticket close to the lamp and read the address aloud, stumbling over the number that was not ours. The older man’s sister took it from him and turned it toward the shop, as if she could compare the writing with the faded numbers above the door. “There was a shop next to yours,” she said to my mother, “before the wall came down.” My mother looked at the counter, then at the narrow space between it and the plaster, where the water had disappeared. The boy moved beside her and put his ear against the wall, his pencil still clutched in his hand; after a moment he beckoned me over.

At first I heard only the train and the rain drumming on its roof, but when the whistle faded there was a faint scraping on the other side, followed by the sound of something set carefully on wood. The boy said he had heard it while he was waiting beneath the floor, although he had thought it was someone working in our shop. My father pressed his shoulder against the plaster, then stepped back and ran his fingers along a seam half-hidden behind a shelf. Together we shifted the shelf, spilling a row of old tins that rolled and rang against the boards, and uncovered a door no wider than my shoulders. The conductor came in when he heard the noise, his watch open in his hand, and told us that the second carriage would not wait long. My mother took the pencil from the boy and pushed its point into the keyhole; something clicked, and the door swung inward a few inches.

A little room lay beyond it, dry except for a dark patch on the floor beneath an empty chair. On the table was a saucer, and beside it a blue mitten, smaller than either of the ones the girl now wore. She reached past my mother for it, but the woman from the first carriage called out sharply, and the child stopped with her hand in the air. The woman had followed us into the shop, holding the rail of the counter as though it were still moving beneath her; she stared at the mitten and asked the older man for the ticket she had given back to him. He unfolded it, and she laid it on the table before sitting in the empty chair, her wet skirt spreading across the dry boards. “I meant to leave a place for her,” she said, looking at my mother, “but I kept waiting for someone else to bring her in.” My mother took the mitten from the table and placed it in the woman’s lap, then drew the little girl nearer without urging her across the threshold.

The bell at the far end of the platform rang again, and this time the conductor did not consult his watch. He held out his hand for my ticket, but my father stepped between us and asked where the carriage would take me. “To the address on it,” he said, though his eyes had gone to the small room, and to the woman sitting with the mitten in her lap. My father took the pencil from my mother and tried to change the number, but the point broke against the paper, leaving a black fleck on his thumb. The boy picked up the broken piece and went back to the wall, where he listened for so long that I thought the scraping had begun again. Then he turned to me, holding the graphite between his fingers, and said, “There’s another door, and someone is asking for you.”