Помогите с кодом С#

Хочу добавить в код еще транспортные средства как инфу, а мне ошибки. Вот код(он рабочий):
using System;
using System.Collections.Generic;

namespace MilitarySimulation
{
public class Vehicle
{
public string Name { get; set; }
public int Speed { get; set; }
public int Armor { get; set; }

public Vehicle(string name, int speed, int armor)
{
Name = name;
Speed = speed;
Armor = armor;
}

public virtual void DisplayInfo()
{
Console.WriteLine($"Vehicle: {Name}, Speed: {Speed} km/h, Armor: {Armor} mm");
}
}

public class Helicopter : Vehicle
{
public int RotorDiameter { get; set; }

public Helicopter(string name, int speed, int armor, int rotorDiameter)
: base(name, speed, armor)
{
RotorDiameter = rotorDiameter;
}

public override void DisplayInfo()
{
base.DisplayInfo();
Console.WriteLine($"Rotor Diameter: {RotorDiameter} m");
}
}

public class Tank : Vehicle
{
public int CannonCaliber { get; set; }

public Tank(string name, int speed, int armor, int cannonCaliber)
: base(name, speed, armor)
{
CannonCaliber = cannonCaliber;
}

public override void DisplayInfo()
{
base.DisplayInfo();
Console.WriteLine($"Cannon Caliber: {CannonCaliber} mm");
}
}

class Program
{
static void Main(string[] args)
{
List<Vehicle> vehicles = new List<Vehicle>
{
new Helicopter("Ka-52", 300, 20, 14),
new Tank("T-80", 72, 120, 120)
};

foreach (var vehicle in vehicles)
{
vehicle.DisplayInfo();
Console.WriteLine();
}
}
}
}