[
  {
    "id": "london-piccadilly-branch",
    "operations": [
      {
        "between": [
          "Park Royal",
          "Ealing Common"
        ],
        "line": "Piccadilly",
        "node": 20698948,
        "op": "insert_station"
      },
      {
        "between": [
          "Rayners Lane",
          "Sudbury Hill"
        ],
        "line": "Piccadilly",
        "node": 2158280269,
        "op": "insert_station"
      }
    ],
    "reason": "Feasibility named patch: North Ealing and South Harrow missing from both directions. Insert the two active railway=station nodes explicitly tagged line=Piccadilly between their named neighbours, in every affected branch pattern. No inference from proximity alone."
  }
]