Derkhan stared out of the window to her left, across the city. On this branch of the Dexter Line, between Ludmead and the industrial zone of New Crobuzon’s south-east, the trains passed at about the midpoint of the city’s tussle with the sky. The mass of roofs was pierced by militia towers in Brock Marsh and Strack Island, and far away in Flyside and Sheck. Sud Line trains passed south beyond the Gross Tar.

The bleached Ribs came and went beside the tracks, towering over the carriage. Smoke and grime built up in the air until the train seemed to ride on a smog tide. The sounds of industry increased. The train flew through clutches of vast, sparse chimneys like blasted trees as the train passed through Sunter. Echomire was a savage industrial zone a little way to the east. Somewhere below and a little to the south, realized Derkhan, a vodyanoi picket is probably massing. Good luck, brothers.

Gravity pulled her to the west as the train turned. It broke off from the Kelltree Line and veered away to the east, gearing up to leap the river.

The masts of tall ships in Kelltree swung into view as the train turned. They teetered and swayed gently in the water. Derkhan glimpsed the furled sails, the massive paddles and yawning smokestacks, the excited, tightly reined seawyrms of trading ships from Myrshock and Shankell and Gnurr Kett. The water boiled with submersibles carved from great nautili shells. Derkhan turned her head to stare as the train arced.

She could see the Gross Tar over the roofs to the south, wide and relentless and bristling with vessels. Antique ordinances stopped the large ships, the foreign ships, half a mile downriver of the confluence of Canker and Tar. They collected beyond Strack Island, in the docklands. For a mile and a half or more, the north bank of the Gross Tar thronged with cranes loading and unloading constantly, bobbing like massive feeding birds. Swarms of barges and tugs took the transferred cargos upriver to Smog Bend and Gross Coil and the mean slum-industries of Creekside; they hauled crates along New Crobuzon’s canals, linking minor franchises and failing workshops, finding their way through the maze like laboratory rats.

The clay of Kelltree and Echomire was gouged by fat square docks and reservoirs, huge culs-de-sac of water that jutted into the city, linked by deep channels to the river, thronging with ships.

There had once been an attempt to replicate the Kelltree docks in Badside. Derkhan had seen what remained. Three massive stinking troughs of malarial slime, their surfaces broken with half-sunk wrecks and twisted girders.

The rattle and boom of the tracks beneath the iron wheels changed suddenly as the steaming engine hauled its charges onto the great girders of Barley Bridge. It veered a little from side to side, slowing on the unkempt tracks as it rose as if with distaste over Dog Fenn.