从文件读取数据填充结构体数组并返回指针时出现段错误求分析

以下C++代码运行时触发「signal: segmentation fault (core dumped)」错误，需求是通过readCarList()函数返回Car类型数组指针来初始化结构体数组。

/*
This code results in "signal: segmentation fault (core dumped)"
The code requires that an array of structures be initialized with the returned pointer to an array of type Car from the readCarList() function
**/

#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

enum  vehicleColor { blue, red, orange, silver, black, green };

struct Car
{
  string brand, model;
  int mileage, year;
  vehicleColor color; // enum type variable
};

// function declaration
Car *readCarList(string file, int numCars);

int main() 
{
  int numCars = 10;

  string fileName = "cars.txt";

  //cout << "Enter a filename:"
  cout <<"  //calling the function....  " << endl;
  
  //Use readCarList function to initalize dynamic array of structures
  Car * vehicle = readCarList(fileName, numCars);

  printCarList(vehicle, numCars); // Call print car list(structArray, 10)

  delete vehicle; // Delete memory to avoid leak
}

Car *readCarList(string fileName, int numCars) 
{
  cout << "Inside of readCarList function";
  int count = 0; 
  string car_color_temp[6];

  //open file for reading
  ifstream inputFile;
  inputFile.open(fileName);

  Car * totalCars; // Pointer to Car variable
  totalCars = new Car[numCars];//Allocate space for 10 elements 

   // Read in data from file into each
  for (int a = 0; a < numCars; a++)
  {
    inputFile >> totalCars[a].brand;
    inputFile >> totalCars[a].model;
    inputFile >> totalCars[a].mileage;
    inputFile >> car_color_temp[a]; //String array for holding color
    inputFile >> totalCars[a].year;
    
    //Convert value read into string array, into structarray[a].color (ENUM data type)
    if (car_color_temp[a] == "blue")
      totalCars[a].color = blue;
    else if (car_color_temp[a] == "red")
      totalCars[a].color = red;
    else if (car_color_temp[a] == "orange")
      totalCars[a].color = orange;
    else if (car_color_temp[a] == "silver")
      totalCars[a].color = silver;
    else if (car_color_temp[a] == "black")
      totalCars[a].color = black;
    else if (car_color_temp[a] == "green")
      totalCars[a].color = green;
  }
  return totalCars;
}

输入文件cars.txt的格式为每行一项信息，每5行对应一辆车的品牌、型号、里程、颜色（枚举类型）、年份，示例如下：

Ford
F-150
200456
blue
2014

已掌握相关课程内容，程序有预期输出，但不需要直接解决问题，仅希望明确代码中的错误点。

内容的提问来源于stack exchange，提问作者damian moore