{
  "type": "railcraft:rolling",
  "key": {
    "a": {
      "item": "railcraft:standard_rail"
    },
    "b": {
      "item": "railcraft:wooden_railbed"
    }
  },
  "pattern": [
    "a a",
    "aba",
    "a a"
  ],
  "result": {
    "count": 32,
    "item": "minecraft:rail"
  }
}