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Twenty-seven minutes after halting for water, Belfast No. 1 pulled out of West Elmont Depot, accelerating back to cruising speed.

This time, Ernest took a seat in the rear inspection coach alongside Samuel and King Edward, while Hollen remained up on the locomotive footplate, claiming he wanted to monitor the draft dampers personally.

Ernest unfolded the longitudinal profile map across the oak table. "We are approaching the first sustained grade on the line: the approach to the High Saddle. A ruling gradient of one point two percent over six continuous kilometers."

Arthur looked up from his ledger. "Is that the hill you spent three weeks surveying around to avoid building a tunnel?"

"It is," Ernest confirmed. "Now we discover whether our tractive calculations hold under sustained operational load."

The gradient began almost imperceptibly, but the locomotive felt the change in resistance immediately.

CHUFF! ... CHUFF! ... CHUFF! ... CHUFF!

The exhaust beats deepened, echoing off the rock faces of the cutting as the driver advanced the cutoff to admit more steam per stroke.

Speed began to drop gradually: thirty-six kilometers per hour... thirty-four... thirty-two... thirty-one.

Ernest watched the speedometer dial intently. "No wheel-slip. Thirty-one kilometers per hour."

Samuel smiled, checking his theoretical tables. "Our baseline estimate for this grade was twenty-eight to thirty-two."

Arthur looked between the two engineers. "You calculated the exact speed of this hill two years ago on a drafting board?"

"Tractive effort minus rolling resistance and gravity vector loads," Ernest replied.

Arthur raised a hand. "Never mind. I withdraw the question."

Halfway up the incline, however, the locomotive’s exhaust suddenly exploded into a rapid, uncontrolled chatter.

SLIP-SLIP-SLIP-SLIP!

The coach jerked as the train lost momentum. Ernest stood up instantly, looking out the forward window.

The driving wheels had broken adhesion against the steel rails. A light, misty drizzle had begun falling over the high pass, coating the polished steel surfaces with a thin, slick film of moisture.

The driver reacted with veteran instinct, immediately throttling back the regulator to allow the driving tires to regain their grip, while opening the steam sander valves.

Fine, dry sand blasted out from the sand-pipes directly beneath the leading driving wheels, crushing between the wheel tires and the rail heads to create artificial friction.

The driving wheels bit hard into the rail.

CHUFF! ... CHUFF! ... CHUFF!

The exhaust rhythm stabilized, the speed held at twenty-seven kilometers per hour, and Belfast No. 1 crested the summit of the pass without stalling.

Ernest let out a steady breath, sitting back down. "The gravity sanders worked as designed."

"A tense thirty seconds, nonetheless," Arthur muttered, pressing a handkerchief to his brow.

"Friction is an unforgiving master, Arthur," Ernest noted, jotting down a memorandum to increase the capacity of the locomotive sand-boxes on production models.

The descent down the northern slope was managed under strict braking control. Handbrakes on the tender and the heavy steam brake on the engine kept the consist capped at twenty-five kilometers per hour, avoiding excessive kinetic heating of the wheel tires.

By two o’clock in the afternoon, the journey had assumed an almost routine rhythm.

At Kilometer 183, the railway ran parallel to the old northern military turnpike for several kilometers. Ernest looked out the coach window and spotted a traditional heavy freight wagon convoy creeping through the deep mud of the road below.

Twenty-seven four-horse wagons, over a hundred exhausted draft animals, and dozens of whip-cracking teamsters were bogged down in axle-deep ruts, struggling to move fifty tons of commercial goods toward the capital.

Belfast No. 1 thundered past on its elevated, crushed-stone embankment at forty kilometers per hour—a single machine, operated by two men, hauling three times their combined cargo with effortless ease.

The teamsters stopped their horses, staring up at the passing train in absolute, stunned silence.

Arthur watched the horse convoy disappear into the distance behind them. "How long did that wagon journey take under the old contracts, Ernest?"

"Thirteen days from the northern pits to Helmarte," Ernest said quietly. "If the weather held."

He checked his pocket watch. It was two-fifteen. They had left the capital that morning.

At four-thirty in the afternoon, the jagged silhouettes of the northern mountains broke through the low autumn clouds. Smoke from distant blast furnaces, coal washeries, and mine pitheads rose against the gray horizon.

Samuel stood up, pointing out the forward window. "North Teucher Junction."

The locomotive slowed as it approached the yard limits. The whistle blew a final, triumphant blast that echoed across the industrial basin.

WOOOOOOOOOOOOOOOOO-OOOOOO!

The entire mining district had shut down for the arrival. Thousands of coal miners, ironworkers, machinists, and their families lined the trackbeds, crowding onto ore trestles and the roofs of freight sheds.

Belfast No. 1 rolled smoothly alongside the newly constructed timber platform of North Teucher Central.

HISSSSSSS! ... CLANK.

The train came to a dead stop.

For half a second, there was silence. Then, a deafening cheer erupted from the assembled crowd. Miners tossed their wool caps into the air, steam whistles on every surrounding factory complex blew in unison, and church bells began pealing across the valley.

King Edward stepped onto the platform, greeted by roaring applause from his northern subjects. Hollen climbed down from the locomotive cab, his white hair and beard covered in black soot, grinning like a schoolboy.

Ernest stepped down onto the ballast, taking the final operational ledger from Samuel.

"Two hundred forty-seven point eight kilometers," Samuel said, his voice thick with pride. "Total elapsed time: eight hours and thirty-seven minutes, including all water and inspection stops."

Thirteen days had been reduced to less than nine hours.

That evening, a working conference was convened inside the North Teucher station offices. There were no banquets or speeches; Ernest insisted on reviewing the mechanical data before any formal celebrations were authorized.

The table was covered with temperature logs, coal weight tallies, and water consumption charts.

"Coal consumption ran six point eight percent above our baseline drafting estimate," the locomotive superintendent reported. "We can optimize that by adjusting the valve lap and training firemen in thin-fire banking."

"Water usage was within nominal tolerances," Ernest noted, reviewing the boiler report. "However, brake response across a twelve-car consist is too sluggish for high-speed passenger operations. We must accelerate the development of continuous automatic vacuum brakes before we open the line to public travel."

King Edward, sitting at the end of the table with a cup of tea, looked across at Ernest. "So, Baron Teucher... do you formally certify the Northern Line?"

"Not tonight, Your Majesty," Ernest replied calmly.

Arthur groaned aloud, burying his face in his hands.

King Edward smiled. "And why not?"

"One successful run proves only that one successful run occurred," Ernest said. "Tomorrow, we run the return trip to Helmarte under a heavier two-hundred-ton load. Then we run dynamic load tests across every major bridge span, conduct emergency stop trials, and verify track settlement."

Edward let out a warm laugh, standing up from his chair. "Take whatever time your engineering discipline requires, Ernest. But when your trials are finished... I want this railway opened to the kingdom."

"It will be, Your Majesty," Ernest promised.

Later that night, the station platform was quiet. The crowds had dispersed, and Belfast No. 1 sat resting beneath the water crane, its boiler fires banked for the night, releasing faint wisps of white steam into the cold mountain air.

Ernest stood alone at the edge of the platform, looking south along the two polished steel rails disappearing into the darkness.

Two years ago, this entire enterprise had been nothing more than a sketch in his private notebook. Now, an industrial lifeline connected the kingdom from south to north.

Footsteps echoed on the wooden planks behind him. Hollen walked up, a cup of coffee in each hand.

"Don’t do it, Ernest," Hollen said, handing him a cup.

Ernest smiled faintly. "Don’t do what?"

"I recognize that look in your eyes," the old founder said, leaning against the timber railing. "You just finished building the greatest engineering work in the history of Belfast, and you are already standing here planning how to make it ten times larger."

Ernest took a sip of the hot coffee, looking back down the empty tracks toward the capital.

"The steelworks at the basin has thirty percent surplus rolling capacity, Hollen," Ernest said quietly. "The machine works can produce two locomotives a month. And the Western Agricultural Line would connect three deep-water ports directly to the capital."

Hollen let out a deep, defeated chuckle, shaking his head under the cold stars. "Go to sleep, Ernest. We have to drive this monster back to Helmarte at dawn."

Ernest laughed softly, his eyes lingering on the dark horizon where the future of the kingdom was already taking shape.

"Tomorrow, Hollen," Ernest said. "Tomorrow we start Line Number Two."