Download the data
The whole MetroMap dataset, free and openly licensed. Every date and cost carries its citation — a verbatim supporting quote and an Internet Archive snapshot — so you can audit any fact rather than take it on trust.
Prefer spreadsheets? phases.csv · sources.csv
- 12
- cities
- 122
- lines
- 710
- phases
- 2,182
- cited sources
What's in the files
JSON is lossless — the complete tree, every source nested under the fact it backs. The two CSVs are a flattened view for spreadsheets: one row per construction phase, and one row per citation (keyed back to its phase) — because nested provenance can’t live losslessly in a single table.
Download one city
Just the curated JSON for a single city (lossless, same schema as the full file).
| Amsterdam | Netherlands | 5 lines | amsterdam.json |
| Barcelona | Spain | 10 lines | barcelona.json |
| Berlin | Germany | 9 lines | berlin.json |
| Boston | United States | 13 lines | boston.json |
| Copenhagen | Denmark | 4 lines | copenhagen.json |
| London | United Kingdom | 13 lines | london.json |
| New York City | United States | 36 lines | nyc.json |
| Oslo | Norway | 5 lines | oslo.json |
| Rotterdam | Netherlands | 5 lines | rotterdam.json |
| Stockholm | Sweden | 7 lines | stockholm.json |
| Tokyo | Japan | 13 lines | tokyo.json |
| Warsaw | Poland | 2 lines | warsaw.json |
License
Use it for anything, including commercially — just attribute it. The dataset is dual-licensed because its two layers have different origins:
- Curated research (dates, costs, citations, confidence, the schema) — CC BY 4.0.
- Line geometry, derived from OpenStreetMap — ODbL 1.0, © OpenStreetMap contributors.
Please cite it as:
MetroMap by Trevor Hinkle — metromap.trevorhinkle.com. Curated data licensed CC BY 4.0; line geometry © OpenStreetMap contributors (ODbL).How it was verified
Every fact is produced by an AI research workflow that fans out per line, requires a source and a supporting quote for each date and cost, and adversarially cross-checks each claim before it enters the dataset. The full method, inflation basis, and live data-quality numbers are on the Sources & methodology page. Found something wrong? Send a correction.