The second continental phase. Two corridors crossing the continent's north and through the centre — SBC #3 Albury to Karumba (south to far north Queensland) and SBC #4 Mackay to Port Hedland (Queensland coast to the Pilbara). Both deployed to the full MMC-VA five-level viaduct standard, building on Phase 1's Alice Hub anchor and the established Megafactory production base.
Phase 2 extends the continental network into the north and through the centre. SBC #3 connects Albury (on the Phase 0 corridor) to Karumba on the Gulf of Carpentaria, opening the central-northern corridor. SBC #4 runs across the top of the continent from Mackay on the Queensland coast to Port Hedland in the Pilbara — a major freight corridor connecting the iron ore export ports to the eastern seaboard.
| SBC #3 | Albury to Karumba — ~2,500km — south–north corridor from the Phase 0 spine to the Gulf of Carpentaria |
| SBC #4 | Mackay to Port Hedland — ~3,200km — northern east–west corridor connecting the Queensland coast to the Pilbara mining region |
| Configuration | MMC-VA — dual-leg, five-level viaduct (the full continental standard) |
| Strategic role | Northern Australia development — freight from the Pilbara to the eastern seaboard, agricultural development across the central north, defence infrastructure access |
| Status | Proposed — project scope and engineering memos to follow Phase 1 commitment and Alice Hub commissioning |
Route alignment is indicative. The corridor shown on the project map is a suggested alignment based on the current planning case. Final geometry is subject to detailed engineering — terrain survey, geotechnical analysis, environmental and cultural heritage assessment, and stakeholder consultation will determine the final alignment at detailed design.
Phase 2 project scope is determined following Phase 1 operational commitment. SBC #3 and SBC #4 corridor specifications, sequencing, and engineering memos will be added here as the programme matures.