Saxby & Farmer · 1856 · Tappet interlocking
Signal Box// LeverFrame
Mechanical interlocking, resurrected for parallel AI agents.
Rule table
Illuminated diagram
Topology oracle · P1 · P2 holdBuilderWaiting
NORTH_TO_BRIDGEMigratorWaiting
SOUTH_TO_BRIDGEDeployerWaiting
BRIDGE_MAINLINEVerifierWaiting
AUDIT_SIDINGThrow a lever: click it, or press 1–8Red stop · yellow distant · black points · blue facing lock · brown clearance