Magnetic levitation corridor transit—commonly called CorridorRail or simply the Spine—forms the primary mass transit backbone of GLMZ's upper and mid-tier districts. Operating on superconducting linear induction tracks embedded beneath reinforced urban arterials, Spine cars travel at sustained speeds between 280 and 410 kilometers per hour within the city envelope, reducing cross-district transit times to under twelve minutes for routes that once required forty. The system runs in evacuated or semi-evacuated concrete tubes at lower elevations and open elevated guideways above the fortieth-floor skyline, creating a dual-layer network that separates high-speed intercorporate commuter traffic from slower urban distribution runs.

The technology itself descends directly from hyperloop and maglev research of the 2030s, refined through a succession of corporate infrastructure contracts awarded exclusively to Helix-Vantage Transit Consortium. Passive magnetic levitation uses cryogenically cooled niobium-titanium coils embedded in car chassis, eliminating rolling contact and reducing maintenance cycles dramatically compared to older rail. Power is drawn inductively from track segments rather than onboard batteries, meaning cars carry no significant energy storage—a deliberate design choice that makes them dependent on the corporate grid and impossible to operate outside authorized corridors. Emergency braking uses eddy current retardation rather than mechanical friction, capable of stopping a fully loaded car from operational speed within 600 meters.

Access to the Spine is tiered by socioeconomic clearance. Platinum-corridor cars serve corporate executives and registered C-suite personnel, featuring private cabin configurations, biometric-locked doors, and real-time route customization. Silver-corridor services accommodate mid-tier workers on fixed timetables, while the so-called Gray Line—technically a separate but interoperable network—runs older, derated cars through lower-mid districts on reduced frequency schedules. Citizens in the unzoned peripheral districts have no legal Spine access whatsoever; the network does not route below District Tier 4 by design, a fact Helix-Vantage frames as a maintenance efficiency decision rather than a deliberate exclusion. Informal transit economies have grown around Gray Line terminus stations, with unlicensed surface runners offering last-kilometer connections into excluded zones.

The social architecture of the Spine reflects and reinforces GLMZ's corporate stratification in ways that feel mundane precisely because they are so legible. A worker's transit clearance tier is embedded in their employment contract and updated in real time by their employer's HR systems—termination events automatically downgrade or revoke Spine access within 90 seconds of processing, stranding workers wherever they happen to be at the moment of dismissal. Civil liberties organizations have documented dozens of cases in which workers were effectively marooned in corporate districts after contract terminations, left to navigate surface transit networks they had not used in years. Helix-Vantage maintains that access management is the employer's contractual prerogative and that the company provides no employment advisory services.