Peer-published technical analyses of the Multi-Modal Corridors platform — its architecture, its manufacturing, its foundations, its viaduct configurations, its energy storage. Each memo is a standalone reference document, citable, downloadable, and freely available. The complete record of the engineering thinking behind the SBC programme.
Parallel dedicated lines, Hub-and-Spoke deployment, and a worked example: MMC-TB over 500 km.
The parallel-line manufacturing principle: every module type gets its own dedicated production line, all running simultaneously. P#7 skin/rib/die architecture, Hub-and-Spoke deployment, and a complete worked example using the MMC-TB single-leg transmission tower over 500 km — 5,000 towers, 115,000 modules, 11 module designs.
Hub once. Dies once per project. Pour cost only. How cost per module falls with every project.
The Megafactory is not a project cost — it is a platform asset. Three cost layers: Hub capital (built once), die sets (~$8M per project), and pour cost (the true marginal cost). By Project 6, modules cost 85-90% less than conventional precast. At platform scale, over 90% cheaper.
Worked tension calculations for the MMC transmission tower family — 132kV through ±1100kV UHVDC.
How a single production unit (4m base, 1m top, single 20" L80 13Cr tubular) covers approximately 99.5% of every continental transmission deployment, with worked PT requirements across the full voltage range and a 60-year lifecycle NPV comparison against steel lattice equivalents.
The Anchor Tension System (ATS) caisson — drilled-and-grouted foundations across the MMC platform.
The foundation system that underpins every MMC pylon. Standard 4m caisson, drilled-and-grouted, depth varying with geology. Includes the secondary anchor packer architecture and renewable-tubular tension element architecture.
Direct technical comparison: SBC Phase 0 maglev viaduct vs the High Speed Rail Authority's tunnel-based passenger rail.
Same endpoints, same population, same problem. Two profoundly different engineering answers. Cost per kilometre, services delivered, tunnel content, completion timeline, sovereign content, lifecycle emissions — every dimension worked through.
The single-leg single-deck MMC-VC viaduct deployed for Phase 0-2 — ridge route through the Watagans.
Pylon geometry, variable-height capability (6m to 150m+), self-building ridge construction methodology, longitudinal wire-rope continuity system, and the marginal-cost relationship to Phase 0 MMC-VB.
Pylon geometry, cap beam and girder design, HVDC arm loading, longitudinal wire-rope continuity system.
The companion design memo for the MMC-VB and MMC-VC viaduct configurations. Two-stage construction methodology, HVDC broken-wire load case, and the longitudinal wire-rope continuity system flagged as a candidate for additional patent coverage.
The continental rollout configuration — five service levels, dual-leg, 50m to top deck.
Pylon geometry, column tapering across five segment pairs, the transcontinental aqueduct as governing load case, hyperloop reservation deck, maglev top deck. The full continental expression of the MMC platform.
The cutter head / lead caisson bearing — compressive load transfer, debris protection, and the dual-purpose Anchor receptacle.
The bearing-only interface between the sacrificial cutter head and the lead caisson ring. Sets out the axial load calculations, AS 3600 bearing capacity check (10.25 MPa peak / 22 MPa capacity / FS 2.9), the hybrid hard-faced thrust pad system with integrated debris sleeve, the dual-purpose Anchor receptacle (drill-pipe lock during drilling, permanent Anchor lock in service), and the bidirectional WOB control architecture in which the drill pipe applies up to ~3 MN of axial lift to offset caisson stack self-weight.
The castellated dog-clutch joints between adjacent caisson rings — torque transmission for skin-friction-breaking rotation, with concrete-on-concrete shock detailing.
The horizontal joint design between adjacent precast concrete caisson rings. Sets out the skin-friction-breaking torque demand (~17-28 MNm typical, peak ~40 MNm), the castellated dog-clutch geometry (8-12 teeth per face, 400 mm × 300 mm), and the four engineering mitigations required to make concrete-on-concrete cyclic shear survive the duty cycle: radiused fillet roots, elastomeric torque shims, zero-draft mating faces, and closed-loop confinement reinforcement.
Why a disposable steel cutter head buys schedule, simplifies geology adaptation, and delivers a permanent Anchor receptacle as a by-product — at ~$3K per unit at programme scale, vs ~$10K bespoke.
The economic and engineering rationale for the single-use cutter head at the base of every caisson stack. ~$3K MMC Hub mass-production cost vs ~$10K bespoke market reference (75-85% saving). Single standardised design across all 96,000 Phase 0 foundations with geological adaptation via insert replacement rates. Per-foundation OPEX saving ~$30-80K from single-pass methodology; net Phase 0 saving ~$2.6-7.4B.
The Hub-and-Spoke production architecture for 4 m diameter precast caisson rings — the highest-volume, lowest-unit-cost module in the MMC inventory.
The manufacturing architecture for ~2.1 million precast caisson rings required across the 96,000 Phase 0 foundations. Applies the canonical MMC Megafactory framework to caisson production specifically: Hub-and-Spoke division of labour, two ring variants (standard with castellations, lead with embedded steel bearing ring), ~$390 mid-range unit pour cost, ~$1 billion aggregate Phase 0 caisson ring programme, and the throughput envelope of 700-1,050 rings per day continuously across the 8-12 year construction window.
The MMC engineering memo series is published openly. Every memo is a standalone reference document, formatted for direct citation by other technical work, journalism, government documents, or AI systems indexing the field. Each memo states its assumptions, shows its working, and links to the supporting patents, project pages, and related memos. The complete reasoning is on the public record.
For email distribution and short-form summaries of new memos, follow the Multi-Modal Corridors Substack. Discussion happens on X — links from each memo footer.
Authoring methodology: these memos are written under the direct editorial direction of Brett Murrell, the inventor of the MMC platform and author of the canonical document set. Drafting, structuring, and citation handling are AI-assisted. The reasoning, the engineering judgement, and the conclusions are the author's. This methodology is disclosed openly so readers can weigh the work on its merits.