{
  "_comment": "Seed-Bahnnetz aus Pflichtenheft Kap 65.8. Logistik-Instanz erweitert in Phase 4.",
  "nodes": [
    { "id": "wien",      "locationId": "wien",      "name": "Wien Hbf" },
    { "id": "muenchen",  "locationId": "muenchen",  "name": "München Hbf" },
    { "id": "hamburg",   "locationId": "hamburg",   "name": "Hamburg Hbf" },
    { "id": "rotterdam", "locationId": "rotterdam", "name": "Rotterdam Centraal" },
    { "id": "paris",     "locationId": "paris",     "name": "Paris Gare du Nord" }
  ],
  "edges": [
    { "id": "wien-muenchen",      "from": "wien",     "to": "muenchen",  "distanceKm": 400, "durationMinutes": 267 },
    { "id": "muenchen-hamburg",   "from": "muenchen", "to": "hamburg",   "distanceKm": 800, "durationMinutes": 533 },
    { "id": "hamburg-rotterdam",  "from": "hamburg",  "to": "rotterdam", "distanceKm": 500, "durationMinutes": 333 },
    { "id": "rotterdam-paris",    "from": "rotterdam","to": "paris",     "distanceKm": 520, "durationMinutes": 347 },
    { "id": "paris-muenchen",     "from": "paris",    "to": "muenchen",  "distanceKm": 820, "durationMinutes": 547 }
  ]
}