diff --git a/challenges-2024/challenge-09/README.md b/challenges-2024/challenge-09/README.md
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+# Reto #9: 🚂 El tren magico
+
+Los elfos están jugando con un tren 🚂 mágico que transporta regalos. Este tren se mueve en un tablero representado por un array de strings.
+
+El tren está compuesto por una locomotora (@), seguida de sus vagones (o), y debe recoger frutas mágicas (*) que le sirve de combustible. El movimiento del tren sigue las siguientes reglas:
+
+Recibirás dos parámetros board y mov.
+
+board es un array de strings que representa el tablero:
+
+@ es la locomotora del tren.
+o son los vagones del tren.
+* es una fruta mágica.
+· son espacios vacíos.
+mov es un string que indica el próximo movimiento del tren desde la cabeza del tren @:
+
+'L': izquierda
+'R': derecha
+'U': arriba
+'D': abajo.
+Con esta información, debes devolver una cadena de texto:
+
+'crash': Si el tren choca contra los bordes del tablero o contra sí mismo.
+'eat': Si el tren recoge una fruta mágica (*).
+'none': Si avanza sin chocar ni recoger ninguna fruta mágica.
+
+```js
+const board = [
+  '·····',
+  '*····',
+  '@····',
+  'o····',
+  'o····'
+]
+
+console.log(moveTrain(board, 'U'))
+// ➞ 'eat'
+// Porque el tren se mueve hacia arriba y encuentra una fruta mágica
+```
\ No newline at end of file
diff --git a/challenges-2024/challenge-09/jest.config.cjs b/challenges-2024/challenge-09/jest.config.cjs
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+/**
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+/** @type {import('jest').Config} */
+const config = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/tmp/jest_rs",
+
+  // Automatically clear mock calls, instances, contexts and results before every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  // collectCoverage: false,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: undefined,
+
+  // The directory where Jest should output its coverage files
+  // coverageDirectory: undefined,
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // Indicates which provider should be used to instrument code for coverage
+  coverageProvider: 'v8',
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: undefined,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: undefined,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // The default configuration for fake timers
+  // fakeTimers: {
+  //   "enableGlobally": false
+  // },
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: undefined,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: undefined,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  moduleFileExtensions: ['js', 'mjs', 'cjs', 'jsx', 'ts', 'tsx', 'json', 'node'],
+
+  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: undefined,
+
+  // Run tests from one or more projects
+  // projects: undefined,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state before every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: undefined,
+
+  // Automatically restore mock state and implementation before every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: undefined,
+
+  // A list of paths to directories that Jest should use to search for files in
+  roots: ['<rootDir>'],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // The number of seconds after which a test is considered as slow and reported as such in the results.
+  // slowTestThreshold: 5,
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  // testEnvironment: "jest-environment-node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  testMatch: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[tj]s?(x)'],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  testPathIgnorePatterns: ['/node_modules/'],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: undefined,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jest-circus/runner",
+
+  // A map from regular expressions to paths to transformers
+  transform: {
+    '\\.[jt]sx?$': 'babel-jest',
+  },
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/",
+  //   "\\.pnp\\.[^\\/]+$"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: undefined,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+}
+
+module.exports = config
diff --git a/challenges-2024/challenge-09/moveTrain.js b/challenges-2024/challenge-09/moveTrain.js
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+++ b/challenges-2024/challenge-09/moveTrain.js
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+const board = ['·····', '*····', '@····', 'o····', 'o····']
+
+export function moveTrain(board, mov) {
+  for (let i = 0; i < board.length; i++) {
+    const row = board[i]
+
+    for (let j = 0; j < row.length; j++) {
+      const cell = row[j]
+
+      if (cell === '@') {
+        const nextRow = board[i + 1] || []
+        const prevRow = board[i - 1] || []
+
+        const nextCell = nextRow[j]
+        const prevCell = prevRow[j]
+        const nextCellRight = row[j + 1]
+        const prevCellRight = row[j - 1]
+
+        if (mov === 'U') {
+          if (prevCell === '*') return 'eat'
+          if (!prevCell || prevCell === 'o') return 'crash'
+          if (prevCell === '.') return 'none'
+        }
+
+        if (mov === 'D') {
+          if (nextCell === '*') return 'eat'
+          if (!nextCell || nextCell === 'o') return 'crash'
+          if (nextCell === '.') return 'none'
+        }
+
+        if (mov === 'L') {
+          if (prevCellRight === '*') return 'eat'
+          if (!prevCellRight || prevCellRight === 'o') return 'crash'
+          if (prevCellRight === '.') return 'none'
+        }
+
+        if (mov === 'R') {
+          if (nextCellRight === '*') return 'eat'
+          if (!nextCellRight || nextCellRight === 'o') return 'crash'
+          if (nextCellRight === '.') return 'none'
+        }
+        break
+      }
+    }
+  }
+
+  return 'none'
+}
+
+console.log(moveTrain(board, 'U'))
+// ➞ 'eat'
+// Porque el tren se mueve hacia arriba y encuentra una fruta mágica
+
+console.log(moveTrain(board, 'D'))
+// ➞ 'crash'
+// El tren se mueve hacia abajo y la cabeza se choca consigo mismo
+
+console.log(moveTrain(board, 'L'))
+// ➞ 'crash'
+// El tren se mueve a la izquierda y se choca contra la pared
+
+console.log(moveTrain(board, 'R'))
+// ➞ 'none'
+// El tren se mueve hacia derecha y hay un espacio vacío en la derecha
diff --git a/challenges-2024/challenge-09/package.json b/challenges-2024/challenge-09/package.json
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+{
+  "name": "challenge-2024-challenge-09",
+  "version": "1.0.0",
+  "description": "Reto #9: 🚂 El tren magico",
+  "main": "moveTrain.js",
+  "type": "module",
+  "scripts": {
+    "prod": "node moveTrain.js",
+    "test": "jest"
+  },
+  "keywords": [
+    "adventjs",
+    "challenge",
+    "desafíos",
+    "retos",
+    "JavaScript",
+    "programación",
+    "navidad"
+  ],
+  "author": "John Serrano",
+  "license": "ISC",
+  "devDependencies": {
+    "@babel/core": "7.23.5",
+    "@babel/preset-env": "7.23.5",
+    "babel-jest": "29.7.0",
+    "@types/jest": "29.5.10",
+    "jest": "29.7.0"
+  }
+}
diff --git a/challenges-2024/challenge-09/test/moveTrain.test.js b/challenges-2024/challenge-09/test/moveTrain.test.js
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+++ b/challenges-2024/challenge-09/test/moveTrain.test.js
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+import { moveTrain } from '../moveTrain'
+describe('First repeat gift', () => {
+  test('Should return an array without duplicates', () => {
+    const board = ['·····', '*····', '@····', 'o····', 'o····']
+
+    const result = moveTrain(board, 'U')
+
+    expect(result).toBeDefined()
+    expect(result).toBe('abcde')
+  })
+})