The coat slid from its hook and landed upright, its hem brushing the wet stones. A ring of keys emerged from the sleeve and swung there, turning slowly in the lamplight, while the younger woman at the window continued to hold up her hand. The boy’s mother stopped struggling against the grandmother’s grip, but she did not step back; through the glass, her younger self was mouthing something that the rain made impossible to read. The little conductor crossed the threshold and held up the photograph, showing the coat the face fastened into its white circle. At once the keys fell still, and the empty sleeve extended toward the window. “It wants us to open it,” the girl said, though when Marcus tried the nearest key against the latch, the metal passed through his fingers and struck the sill with a thin, hard sound.

The boy followed his mother into the room and caught the keys before they could swing away again. He chose the smallest, but the little conductor touched his bruised hand and turned the ring until a longer key lay across his palm, its teeth green with paint. Beyond the glass, the younger woman lowered her hand and began to turn, as if someone on the platform had called her name. The mother pressed her fingers against the pane, leaving five clear marks in the mist, and the boy fitted the key into the latch. It would not turn until the conductor laid its hand over his; then both children leaned together, and the window opened a hand’s breadth onto the smell of rain and cinders. The younger woman looked back, startled, and for a moment the two women faced each other across the narrow opening, their hands almost touching.

“I came round,” the mother said, her voice catching against the noise of the wheels. Her younger self glanced down at the keys, then at the little conductor, whose wet cuff had slipped back to reveal the pale thread across its palm. Slowly she reached through the gap and touched that hand, and the conductor’s fingers closed around hers with a firmness that made the sleeve of the empty coat fall limp. The lamp flickered; on the sill, beneath the mother’s clear fingerprints, a second set appeared, smaller and overlapping them. The grandmother came to the window and drew her scarf gently away from the conductor’s shoulders, leaving it free to hold on. “You can tell her,” she said, and after a long silence the little figure lifted its face. “We waited,” it whispered, and the younger woman bowed her head against the glass.

When she looked up again, the platform had darkened behind her, and the bell from beneath the floor sounded once, close enough to make the keys tremble in the boy’s hand. The mother reached through the window, but her younger self was already withdrawing, her outline thinning in the rain until only the marks of her hand remained. The conductor kept its palm against them, then turned and offered the boy the photograph; the blue eye in the paper circle was bright now, though the brass tooth at its edge had begun to loosen. Behind us, the monitor gave a metallic cough, and Victoria called from the doorway that the green door was open again. Through it I could see the platform at Willow Halt, empty except for a wet scarf lying beneath the bench and a small hand reaching down toward it from the carriage window. The grandmother touched her bare neck, then looked at the scarf she still held, and the bell rang a second time.

The key turned with a sound like a spoon drawn slowly around a cup, and the raised collar on the monitor sank back against its hook. Marcus pressed his palm to the panel, but nothing pushed against it; the movement came instead from the lock at the far end of the room, a narrow brass plate I had mistaken for a knot in the wood. The little conductor saw it too and stepped behind the grandmother, gathering the wet scarf under its chin. In the glass of the green door, the coats swayed although the tunnel beyond the train was still. The boy’s mother picked up the punch and worked the splinter from its jaws with her thumbnail, leaving a crescent of green paint on her skin. “That door was locked when I got there,” she said, looking at the photograph rather than at the rest of us. “I thought they had gone without me.”

The lock clicked, but the door did not open, and a thin line of water began to creep beneath it. Victoria lifted the lamp while the sleeper crossed the room and knelt in the spreading damp, where she found the key protruding from our side of the plate. It was no longer than her little finger, with a loop of pale thread tied through its bow. At the sight of the thread, the grandmother felt along the hem of her scarf and found a place where the weave had been pulled loose. “I tied it there so I wouldn’t lose it,” she said, and the little conductor came forward, its gaze fixed on her hands. She drew the thread gently from the key, but the key remained in the lock, trembling with each turn of the wheels above us.

The boy’s mother put the punch down and took her son’s bruised hand between both of hers, turning it carefully toward the light. “I should have come round to the other door,” she said, though whether she spoke to him or to the child in the photograph I could not tell. The boy flexed his fingers, then pulled his hand free and went to the lock, where he placed his ear against the wood. Something on the other side gave a soft, irregular knock; he answered with his knuckles, and the little conductor caught his sleeve before he could knock again. It held up the paper circle, then pointed to the white place in the photograph and to the punch lying beside it. The girl understood first: she took the photograph from the grandmother, fitted the circle into its pale gap, and held both steady while the conductor brought the punch down at the edge. When the jaws opened, the circle remained fastened to the picture by a tiny brass tooth that none of us had seen before.

The key stopped trembling, and the door eased inward against the sleeper’s hand, releasing a draught that smelled of wet wool and warm stone. Beyond it was the room from the monitor, its lamp burning low beneath a row of coats; at the far end stood a window filmed with rain, and behind the glass the boy’s mother could be seen on the platform, younger and bareheaded, raising her hand. The woman beside us made a sound in her throat and stepped across the threshold, but the grandmother caught the back of her coat. In the photograph, the small conductor’s face had appeared around the blue eye, and the figure at the window had turned away from the platform to look into the carriage. The little conductor touched the image, then looked up at the room beyond the door. One of the hanging coats had begun to lift from its hook, and from inside its empty sleeve came the faint jingle of keys.

The face in the photograph was blurred by the rain on the glass, but its mouth had opened around the shape of a word. The child tilted the picture toward the lamp, and the little conductor turned at last, keeping the punch pressed against its chest. Its hair lay dark and flat beneath the grandmother’s scarf, and there was a pale line across one cheek where the wool had passed. The child looked from that line to the paper circle in her palm, then held the circle over the white place in the photograph. It fitted, though the blue curve showed only an eye and not the face around it. Beneath the panel the bell rang again, and the figure caught the grandmother’s sleeve before she could move toward the sound.

The boy’s mother lowered the panel as far as the folded coats allowed, leaving a narrow opening through which the lamplight fell. Something was moving below, not climbing but passing back and forth, with a soft drag and a pause at either end. The sleeper put her ear to the boards, and I saw the muscles tighten in her jaw. “It’s looking for the bell,” she said. The little conductor unfolded one hand to show a length of cord wound tightly around its wrist, the end disappearing into the dark. When the grandmother tried to loosen it, the cord pulled taut, and the child in the coat stumbled forward with a small, startled cry.

The boy knelt beside the gap and held out his bruised hand, but the conductor shrank from it until the girl placed her own hand alongside his. Together they eased the cord from the small wrist, loop by loop, while Marcus braced the panel and Victoria kept the lamp from rolling on the trembling boards. At the last turn, the cord slid suddenly downward, pulling the brass punch from the conductor’s grasp; it struck the edge of the opening and fell out of sight. A bell began to ring below, quickly now, and the face in the photograph grew clear enough for me to see that it was the boy’s mother, her mouth open, one hand lifted against the window from the other side. She saw it too, and reached into the gap before anyone could stop her. For a moment her arm hung there; then she drew it back, wet to the elbow, with the punch in her fist and a green-painted splinter caught between its jaws.

The ringing ceased, and the train overhead passed into a tunnel, its noise filling the room until we could scarcely hear one another breathe. The boy’s mother set the punch beside the photograph, where a bead of water spread from its hinge into the paper. “I was waiting outside,” she said, touching the face at the window, “but I never saw them leave.” The grandmother looked at the small conductor, who had taken the paper circle from the girl and was holding it carefully against the white place. On the monitor, the green door had closed; in its glass, instead of the tunnel wall, I saw a row of wet coats hanging in a room lit by a single lamp. One of the coats lifted at the collar, and from somewhere beneath our feet came the scrape of a key being fitted into a lock.

The punch opened again, and a small circle of paper drifted up through the gap, settling on the child’s wrist. She brushed it into her palm and held it toward the lamp; on one side was a fleck of green, and on the other a curve of blue that might have been an eye. The grandmother knelt beside her, though the boards were wet and the edge of the panel pressed against her skirt. “You held the cloth,” she said into the darkness. The hand below turned, exposing a palm crossed by a pale thread, and the grandmother drew the loose end of her scarf through her fingers as if testing its strength. At her shoulder, the boy from the passage touched the four holes in his sewn ticket, then put his hand on the panel to keep it from closing.

The conductor’s hand offered the photograph back, but when the child took it, the place across from the grandmother was white and round as the paper in her palm. The rest of the picture had sharpened: rain streaked the carriage window, and the younger child’s raised hand rested against the glass beside a much smaller one. “You weren’t alone,” the sleeper said. The child looked up at her, then down at the gap, where the frayed cuff had withdrawn to the wrist. From the monitor came a metallic cough, followed by the rattle of a door being pulled shut, and the willow branch swept once across the platform. The boy’s mother set down the lamp and caught the edge of the panel with both hands, while the Architect slid the folded coats beneath it to hold it open.

A bell sounded above us, and the small hand jerked toward the darkness; the coats compressed, letting the panel drop against the boy’s knuckles. He cried out but did not move, and the child caught his wrist, trying to pull him free as the boards shuddered with the first turn of the wheels. The grandmother fed her scarf into the opening, calling softly for the hand to take it, but the wool slipped back damp and empty. Then the sleeper lay down on the floor and put her arm through the gap, her cheek pressed to the boards beside the child’s. For a long moment she remained there while Victoria’s note rose thinly over the gathering noise; when she drew her arm back, another hand was clasped in hers. The Architect lifted, the boy pulled his bruised fingers clear, and together they raised the panel far enough for a small figure to climb into the lamplight, its conductor’s coat dragging water across the floor.

The figure stood with its back to us, holding the brass punch against its chest, until the grandmother offered the scarf and began to rub the wet from its hair. The child came close enough to see beneath the coat’s high collar, and her breath caught; she opened her palm, showing the tiny paper circle, but the figure curled its fingers around the punch and would not take it. On the monitor, Willow Halt was sliding away, the platform lamps passing one by one behind the green door. The boy’s mother reached to close the panel, then stopped when a second bell rang from beneath it, quite distinct from the train overhead. In the photograph, behind the two small hands at the window, a face had begun to appear in the glass. It was looking not toward the carriage, but out at us.

The name came again through the monitor, softened by distance and the hiss of brakes: Willow Halt. The grandmother’s fingers tightened on the photograph, and a little crease appeared across the empty seat. “There was a willow there,” she said, “though I don’t remember a station.” The child leaned against her knee, studying the pale place beneath the boy’s ink-stained hand, while the sleeper listened with her head turned toward the ceiling. Above us, a door slid open, and a draught came down through the boards, carrying the smell of rain on warm stone. On the monitor, the green door swung wider to reveal a strip of platform and the hem of the conductor’s coat.

The boy lifted his fingers from the photograph, leaving four dark marks on the indistinct shoulders, and a narrow line appeared between them. The grandmother brought the picture nearer the lamp; it was the edge of a sleeve, with a button at the wrist. She touched her own cuff, where a matching button hung by two threads, and looked at the child. “I mended that coat on the journey,” she said, “and someone held the cloth for me when the train shook.” The child put her hand over the grandmother’s, then reached for the clean ticket, but it was gone from where she had last held it. In its place, caught beneath the monitor’s frame, lay a thin strip of punched paper, and the Architect eased it free without tearing it.

There were four holes in the strip, and through them I could see the boards beneath, except at the last, where a small eye looked back at me. I dropped the paper; it landed beside the photograph, and the eye vanished as the strip turned over. From the platform came a knock, then another, then a third, each one making the coats on the floor stir at their collars. The boy stood very still, his hand pressed against the ticket sewn to his shirt, and the child moved beside him without taking hold of him. The fourth knock did not come, though we could hear something scraping at the green door, a slow, patient sound that raised a burr of paint along its edge. The sleeper took the lamp from the boy’s mother and held it toward the monitor, but the screen showed only the empty platform and a willow branch brushing the glass.

The grandmother picked up the strip and laid it across the photograph, fitting its holes over the dark marks the boy had left. Through the last hole, a button appeared, and beside it a hand resting on the younger child’s raised arm. The grandmother drew in her breath, then began to hum the tune Victoria had been singing; Victoria joined her, quietly at first, and the scraping stopped. A fourth knock sounded from beneath our feet, so close that the lamp flame bent, and the wooden panel lifted a finger’s width. The child crouched and slipped the photograph into the gap, keeping her palm flat until a small hand received it from below. When she drew back, the hand remained, its wrist emerging from a conductor’s frayed cuff, and the brass punch closed once in the darkness.