How this monitor is built

The key milestones of the deployment of the Atlantic Corridor —one of the nine European Transport Corridors of the TEN-T network (Regulation (EU) 2024/1679)— across Asturias, León and Galicia: Pajares Bypass, electrification, UIC gauge, urban nodes, port connections, line 800 and ERTMS signalling.

For each milestone we record the first publicly promised delivery date (baseline) and every subsequent re-announcement. The delay is computed against the baseline, never against the latest forecast.

The accumulated delay is the sum of the individual slippages of the actions; since many run in parallel, it does not represent a sequential time span. We break it down into three natures: consolidated (historical delay of what is already delivered), committed (slippage of the delivery date of pending milestones) and overdue (days past the latest promise without completion). All figures are computed against an explicit cut-off date so they are reproducible.

Each action is tracked along ADIF's project lifecycle: informative study → public information → environmental decision → detailed design → tender → award → contract signing → site handover (actual start) → construction → acceptance → AESF testing → commissioning. A completed civil works does not equal a line in service: track, electrification and signalling/ERTMS are independent contracts that often mark the real bottleneck.

Cost indicators: bid budget (PBL), award amount, award discount, certification and modifications. The critical path of the strategic goal (end-to-end UIC freight) is modelled as a chain of dependent actions: a single missing piece blocks the goal.

Every figure flags its provenance: official (published by ADIF, MITMA, BOE or PLACSP), PMO estimate (reconstruction from public milestones) and pending. A published figure is never silently mixed with a reconstruction.

Only data from official sources or contrasted media outlets is incorporated, and when a figure comes from the press it is labelled as such. Each data point records its source URL and the date of its latest ingest.

• Physical works progress data is not always public. We complement it with contrasted press notes.
• Rail traffic by specific segment is not published; available aggregates are by corridor (Eurostat) or national (CNMC, INE).
• Budget data arrives several months late. We always state the period of the latest available data point.
• Map geometries come from ADIF's official WFS (IDEADIF, INSPIRE Railway Transport Network 3.0).
• Tracking coverage is currently denser in Asturias (37 milestones) than in León (12) and Galicia (13); it will be completed in successive waves.

This monitor is an independent tool. It does not replace the official information of ADIF, MITMA or other bodies: it aggregates it, organises it and makes it publicly available.