"That sounds like a useful distinction for journalism as well."
They talked about the old retaining walls that supported roads and railway lines through the mountains. Bea said her uncle had worked at Rook Reservoir, where water was held behind a concrete barrier built before anyone expected winter storms to arrive so violently. Mina asked whether the new drainage project had been completed.
"Officially," Bea said. She stretched the word until it sounded like a warning.
An announcement interrupted them: the train would reduce speed through the mountain sector because of adverse weather. The voice belonged to Harker. He kept the tone cheerful, adding that refreshments would be available throughout the evening and that passengers were encouraged to enjoy the panorama from the forward lounge. There was no panorama now, only darkness cut by the train's own light.
Mina wandered toward the lounge. The floor changed texture beneath her shoes where old and new carriages joined. A brass plaque described the Northline as a monument to human ingenuity. Beneath the plaque, a small service hatch trembled with a steady rhythm. Mina crouched to look at it, and a cleaner paused beside her with a stack of folded cloths.
"Loose fitting?" he asked.
"Probably just resonance. It changes when the wheels cross a joint."
The man nodded as if the explanation comforted him. His name was Noel, and he had cleaned trains for fifteen years. He told her the new coaches had fewer squeaks, but the older route still spoke through the wheels. "People with money pay not to hear the railway," he said. "Sometimes the railway has news anyway."
Jun appeared from the connecting door carrying a rolled diagram. He noticed the sensor box in Mina's bag. "You're the competition winner," he said. "The device in the magazine?"
Mina immediately wished her coat looked cleaner. "Yes. Are you an engineer?"
"An inspector in training. Mostly I check numbers other people are tired of checking."
He asked how she separated weather effects from structural changes. She described building a baseline over several days and flagging outliers rather than declaring failures. Jun listened closely, then asked a different question: could changing water pressure produce a pattern before visible leakage appeared? She said it might, depending on the structure and mounting point, but no conclusion would be valid without calibration and independent measurement.
Jun looked pleased by her refusal to overpromise. "I wish more people said that," he admitted.
Through the window, the trackside lights became farther apart. They passed a maintenance hut with a small amber lamp burning by its door. Jun recognized the location and checked his watch. For several seconds his expression was unreadable.
"Something wrong?" Mina asked.
"A log entry says the hut's flood sensor is offline for scheduled calibration. But the maintenance window ended yesterday."
"Could the log be late?"
"Could be. I just don't like the collection of could-bes."
He moved away before she could ask more. Mina stared out at the rain and thought of the map in her bag, of a small shape representing a retaining wall, of the invisible pressure on the other side. She had once told a judge that her invention was less about predicting disasters than listening when ordinary materials told the truth. It had sounded theatrical in the auditorium. On the moving train, approaching dark mountains under heavy rain, it seemed a responsibility. She returned to her seat and opened the map.
CHAPTER 04
THE BROKEN GAUGE
Mina spread the engineering map over the empty place setting and held its corners down with a spoon and a glass. The document came from a public planning archive. It showed the railway as a red line, the reservoir in pale blue, and the drainage galleries as thin gray threads beneath the ground. The original survey was twenty years old. Recent restoration notes had been pasted over it in crisp digital type, so the two eras of design sat together without quite agreeing.
Bea came back with tea. "Research during a holiday?" she asked.