[
 {
  "name": "Trolley Run",
  "spawn": {"x": 33.0, "z": 52.0, "dx": 0.0, "dz": -1.0},
  "streams": [
   {"pts": [[-70.0, 15.0], [70.0, 15.0]], "speed": 11.0, "interval": 2.0},
   {"pts": [[70.0, 12.0], [-70.0, 12.0]], "speed": 12.0, "interval": 2.4},
   {"pts": [[-70.0, -21.0], [70.0, -21.0]], "speed": 10.0, "interval": 2.2},
   {"pts": [[70.0, -24.0], [-70.0, -24.0]], "speed": 12.0, "interval": 2.8}
  ],
  "targets": [8000, 20000, 40000]
 }
]