The Diverted Junction

A four-inch steel roof flange was not designed to bend inward like wet cardboard, but the weight of ten tons of boiling asphalt made iron behave like putty. Pelagia braced her boots against the vibrating floorplates of Locomotive 404, both hands clamped around the manifold bleed wheel as the roof groaned. Liquid nitrogen sloshed violently behind the cab's rear bulkhead. If the monster above punctured the primary insulated vessel rather than the auxiliary lines, forty thousand gallons of minus-three-hundred-degree coolant would flash to gas instantly, displacing every lungful of air in the cabin before freezing their blood solid.

"Hold that bypass open!" Pelagia shouted over the shriek of tearing metal. "Kyriakos, do not dump the main reservoir! If you vent the central tank, we lose the pressure head for the injectors and suffocate on the catwalk!"

Kyriakos kept both palms locked onto the red iron lever, his knuckles stark against the rust. "The claws are through the outer skin! Five inches from the secondary feed line!"

Above their heads, the corrugated steel warped under a deafening crunch. Two black, glistening appendages punched through the reinforced ceiling, dripping foul-smelling grease that smoked against the boiler jacket. The Tar-Stalker was not merely riding the tender; it was digging toward the high-octane sulfur lubricants in the drive bearings.

Damathea raised her long-barreled rifle, bracing the stock against her hip to absorb the locomotive's lateral sway. "Tell me where to shoot, engineer. I have three tungsten penetrators left before I resort to throwing spanners."

"Hit the ventral tendon behind its forward clasp," Pelagia said, tracking the pressure gauges with a practiced sweep. The needle on the auxiliary manifold trembled at three hundred and eighty pounds per square inch. "Don't puncture the shell. Crack the outer crust so the vapor has a path into its core!"

Damathea fired. The deafening report inside the enclosed cab was instantly swallowed by the roar of the engine. The sabot punched upward through the torn ceiling plate. A thick spray of pressurized black fluid hissed across the observation slit, followed by an ear-splitting howl that rattled the cab's brass dials.

The creature shifted its massive bulk, lunging toward the source of the muzzle flash. That movement dropped its chest mass directly over the tender's dorsal discharge port.

"Stathios!" Pelagia called out, her fingers flying across the auxiliary regulator valves to balance the feed lines. "Give me twenty pounds of boiler steam to prime the atomizers! Now!"

Stathios leaned hard into the throttle quadrant, adjusting the reverser bar with a single, brutal shove of his shoulder. "You have your steam, Pelagia! But look out the forward glass! Junction Ten is nine hundred yards out, switch points aligned straight into the municipal chlorine depot! If we hit those chemical tanks at sixty miles an hour, we won't need nitrogen to kill us!"

The red signal lamps of the chlorine battery flared through the greasy haze ahead. Rows of cylindrical pressure vessels sat behind a low concrete revetment, directly in the path of their current track alignment.

"Take the turnout to the right!" Pelagia ordered. "I'm routing the cryogenic pulse through the roof vent!"

"Discharging six thousand gallons of pressurized industrial coolant inside municipal limits without a hazard permit is a Level Four misdemeanor," Pelagia added under her breath, wrenching the secondary valve clockwise until the copper gasket screeched. "Six-month suspension of operating license."

Damathea fired her second penetrator into the beast's exposed ribbing, cracking the thick, rubbery armor wide open. "File the paperwork tomorrow, Pelagia. Vent the tank!"

Pelagia slammed her palms down on the emergency discharge quadrant.

Compressed liquid nitrogen surged through the auxiliary feed pipes with a metallic shriek. A plume of white, superchilled mist erupted through the fractured roof plates, engulfing the Tar-Stalker's underbelly. The transformation was instantaneous and violent. The viscous, boiling tar hardened in fractions of a second, turning from glossy pitch into a dull, crystalline gray. Stress fractures webbed across the creature's limbs with the sound of snapping timber.

The beast tried to pull back, but its vitrified joints locked solid.

"Kyriakos, dump the secondary steam injector!" Pelagia commanded.

Kyriakos threw the auxiliary handle. A wall of boiling boiler exhaust slammed into the frozen mass. The extreme thermal shock did what artillery rounds could not: the beast's chest plate shattered like tempered glass under a sledgehammer. Thousands of jagged, frozen tar fragments rained down across the cab roof and bounced across the speeding high-line tracks.

The remaining bulk of the creature tore free from the roof mountings, tumbling backward into the slipstream. It struck the stone abutment of the high-line viaduct, disintegrating into a harmless drift of black gravel.

Inside the cab, the sudden loss of top-heavy ballast caused Locomotive 404 to lurch on its springs.

"Switch points coming up!" Stathios yelled, hauling back on the heavy reversing gear. "Brace the deck!"

He slammed open the high-pressure steam injector, venting a superheated blast across the turnout blades to force the iced mechanism open. The points at Junction Ten slammed over with an iron shriek just as the locomotive's leading trucks crossed the frog.

The engine tilted hard to the right, wheels squealing against the flange, before snapping onto the rising grade of the Quarry Spur. Behind them, the low, lethal towers of the chlorine gas storage slid away into the dark, untouched.

Pelagia wiped a streak of greasy condensation from her forehead and inspected the main tank telemetry. The primary cryogenic vessel stood at seventy-two percent capacity—more than eighty-five thousand gallons of liquid nitrogen remained intact and pressurized.

"Main tank integrity holding," Pelagia said, her voice dropping into the steady cadence of a safety report. "We kept the payload."

Kyriakos sank against the bulkhead, his hands trembling as he let go of the vent lever. "We made the spur."

"We made the spur," Damathea echoed, sliding a fresh magazine into her rifle receiver with a clean, dry click.

Stathios eased the throttle back a notch, settling the heavy engine into a rhythmic, chugging climb toward the high limestone ridges of the old quarry. He reached into his coat and produced an unlit cigar, rolling it between his teeth without taking his eyes off the rails.

Pelagia climbed the cab's access ladder to the forward observation cupola to inspect the viaduct behind them.

The city of Halikarnas stretched out across the basin, blanketed in a suffocating shroud of chemical smoke. But the fire was not confined to the cracked catalytic plant.

To the south, east, and west, along every primary crude pipeline corridor, dozens of yellow flare stacks burned in reverse, sucked dry by unnatural drafts. Through the haze, dark, fluid shapes moved in coordinated columns along the arterial rail beds and canal sluices. Thousands of them.

The beast destroyed on the tender had been an outrider driving the herd.

Every pipeline, every storage manifold, and every rail line in Halikarnas was channeling the swarm directly toward the pressurized LNG fuel depot at the center of the city.

Pelagia rested her hand on the cold rim of the cupola hatch. The quarry lay ahead, silent and waiting, but the run to save the city had barely begun.