In short, all of the List<inheritances> of INTERFACE can be called, It actually works just like Stack.Pop

ListsExtension.cs

public static class ListsExtension
{
    public static T Pop<T>(this List<T> clist, int index) where T : INTERFACE
    {
        var c = clist[index];
        cargos.RemoveAt(index);
        return c;
    }
}