Frictional pushback was the invisible tax that primitive logistics paid to gravity.
Inside the staging portal of the Great Sunless Incline at Depth Five Thousand, Giles Croft crouched beside the freshly graded track bed.
He held a cast-iron spirit-level across the twin crowns of two thirty-pound steel rails. He watched the amber bubble settle between the etched fine-tuning lines.
Beside him, Toby Karr checked the track gauge with a tuned wooden spacing bar.
The brass measuring tongs ends rested against the inner rail heads, clicking snugly into place without a tiny fraction of an inch of play.
“Thirty-six inches dead even across the entire hundred-foot tangent,” Toby reported, marking the tie with yellow lumber chalk.
“Ballast tamping crew has finished the second pass with the air-powered tampers. Dark rock stone is locked tight.”
Giles stood up, dusting crushed rock dust from his trousers.
