Authority order
Use this order when a route looks possible but the actual rail value depends on station choice, comfort, and timing.
| Rank | Source layer |
|---|---|
| 1. | Source layer: SRT public schedule and train pages for official train identity, station names, and baseline long-distance timing. |
| 2. | Source layer: BTS and MRT public pages for station, line, fare, and service-notice context inside Bangkok. |
| 3. | Source layer: Namtang GTFS and OSM for stop geometry, interchange logic, and machine-readable static transport structure. |
| 4. | Source layer: Road, weather, and route context when train simplicity is better or worse than flight, bus, or car. |
| 5. | Source layer: Commercial booking or seat layers only when explicit authorization exists. |