18,758 m of alignment between chainage ch 10,000 m and ch 28,758 m, from the Railway Order route drawings. Every metre is one of six construction forms; the split is what decides cost, programme and disruption.
Bored tunnel is 62% of the route. The M401 / M402 boundary sits at ch 19,325 m, just north of Northwood — the point where the tunnel drive ends and the surface railway begins.
11 underground, 5 at surface or elevated. 8 offer an interchange. Chainage is measured along the Railway Order alignment.
Colour is the civils package that builds the station box. Click any station on the map for its Railway Order description, published facts and visualisation.
Senior Government figures, reported 27 July 2026. Advertised maximum contract values total ≈€17.65bn, plus ≈€725m spent to end-2026. The €9.5bn figure is the 2022 preliminary business case midpoint of a €7.16–12.25bn range — four years old and superseded.
Package figures are advertised maximum contract values from the contract notices — ceilings, not forecasts. Open a package on the left for its scope and what the number covers.
Granted by An Coimisiún Pleanála 2 October 2025; operative January 2026
The Railway Order is the statutory consent for the scheme — it fixes the alignment, the station boxes and the powers to acquire land. Everything drawn on this map is taken from the granted order, so the geometry here is the consented geometry.
Cabinet decision on proceeding to tender — autumn 2026
Until that decision, the live delivery-integration work is early works coordination under M100 and readying the main civils packages for tender.
Mid-2030s
GoA4 — unattended train operation, driverless
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