public class Station : IEntitie
{
    [Key]
    public int Id { get; set; }

    public string Description { get; set; }
}


public class OperativeSchedule : IEntitie
{
    [Key]
    public int Id { get; set; }

    public virtual Station DispatchStation { get; set; }                  //для таблицы station надо задать ключ
    public virtual Station StationOfDestination { get; set; }             //для таблицы station надо задать ключ
}

modelBuilder.Entity<Product>()
            .HasOptional(p => p.Category)
            .WithMany()
            .WillCascadeOnDelete(true);