So, I code something in JS, and I don’t know why it doesn’t want to make a round of the railway when I put the train on the rail. Please I need help. I tried everything, like renaming the variable, changing the algorithm but nothing. Please see the demo on the image description:

function avancerTrains() {
    // Parcourir le plateau pour trouver les trains et les faire avancer
    for (let x = 0; x < plateau.largeur; x++) {
        for (let y = 0; y < plateau.hauteur; y++) {
          const currentCase = plateau.cases[x][y];
          if (isTrain(currentCase)) {
            moveTrain(x, y, currentCase);
          }
        }
      }
      
      function isTrain(caseInstance) {
        return caseInstance instanceof Type_de_train;
      }
      
      function moveTrain(x, y, train) {
        if (train === Type_de_train.Locomative_Seule) {
          moveLocomotive(x, y);
        } else if (isWagon(train)) {
          moveWagon(x, y, train);
        }
      }
      
      function isWagon(train) {
        return [
          Type_de_train.Wagon_A_Sa_Gauche,
          Type_de_train.TroisWagon_A_Sa_Gauche,
          Type_de_train.CinqWagon_A_Sa_Gauche,
        ].includes(train);
      }
        
      function moveLocomotive(x, y) {
        if (canMoveRight(x, y) && isHorizontalRail(x + 1, y)) {
          swapCases(x, y, x + 1, y, Type_de_case.Rail_horizontal, Type_de_train.Locomative_Seule);
        }
      }
      
      function moveWagon(x, y, wagon) {
        if (canMoveRight(x, y) && isHorizontalRail(x + 1, y)) {
          swapCases(x, y, x + 1, y, Type_de_case.Rail_horizontal, wagon);
        }
      }
      
      function canMoveRight(x, y) {
        return x + 1 < plateau.largeur;
      }
        
      function isHorizontalRail(x, y) {
        return plateau.cases[x][y] === Type_de_case.Rail_horizontal;
      }
      
      function swapCases(x1, y1, x2, y2, caseType1, caseType2) {
        plateau.cases[x1][y1] = caseType1;
        plateau.cases[x2][y2] = caseType2;
      }
    // Redessiner le plateau après avoir déplacé les trains
    dessine_plateau(canvas.getContext("2d"), plateau);
}