如何将类节点添加到通用链表？

Question

我正在创建一个通用链表，并且必须创建两组数据。

第一个文件是“ auto.txt”，其中包含以下格式的汽车信息：

Brand Model Year

第二个文件是“ moto.txt”，其中包含以下格式的摩托车信息：

Brand Model Year Engine

我制作了一个双向链接列表，我需要制作两个列表，一个包含摩托车，另一个包含汽车。但是，出现以下错误：

cannot convert from 'L3_Console.Car' to 'T'
cannot convert from 'L3_Console.Motorcycle' to 'T'

这是我的代码：

class Program
{
    static void Main(string[] args)
    {
        GenList<Car> Cars = Read<Car>("auto.txt");
        GenList<Motorcycle> Motorcycles = Read<Motorcycle>("moto.txt");
    }

    public static GenList<T> Read<T>(string Failas)
    {
        GenList<T> List = new GenList<T>();
        using (StreamReader reader = new StreamReader(File.Open(Failas, FileMode.Open), Encoding.GetEncoding(1257)))
        {
            string line;
            while ((line = reader.ReadLine()) != null)
            {
                string[] parts = line.Split(' ');
                if (typeof(T) == typeof(Car)) List.Add(new Car(parts[0],parts[1],int.Parse(parts[2]))); //error here
                else if (typeof(T) == typeof(Motorcycle)) List.Add(new Motorcycle(parts[0], parts[1], int.Parse(parts[2]),parts[3])); //error here
            }
        }
        return List;
    }
}

public sealed class GenList<T>
{
    private sealed class Node<T>
    {
        public T Data { get; set; }
        public Node<T> Previous { get; set; }
        public Node<T> Next { get; set; }

        public Node() { }

        public Node(T data, Node<T> adr_p, Node<T> adr_n)
        {
            Data = data;
            Previous = adr_p;
            Next = adr_n;
        }
    }

    private Node<T> start;
    private Node<T> end;
    private Node<T> current;


    public GenList()
    {
        this.start = null;
        this.end = null;
        this.current = null;
    }

    public void Add(T data)
    {
        var dd = new Node<T>(data, null, start);
        if (start != null)
            start.Previous = dd;
        else end = dd;
        start = dd;
    }

}
public class Car
{
    public string Brand { get; private set; }
    public string Model { get; private set; }
    public int Year { get; private set; }

    public Car(string brand, string model, int year)
    {
        Brand = brand;
        Model = model;
        Year = year;
    }
}
public class Motorcycle
{
    public string Brand { get; private set; }
    public string Model { get; private set; }
    public int Year { get; private set; }
    public string Engine { get; private set; }

    public Motorcycle(string brand, string model, int year,string engine)
    {
        Brand = brand;
        Model = model;
        Year = year;
        Engine = engine;
    }
}

如何正确地向列表中添加一个新节点，其中包含一个类，该类取决于函数的调用方式？谢谢