Lady Hatt is Sir Topham Hatt's wife. The engines are extremely fond of her and like when she visits the railway or rides in one of their coaches. A kind and gentle woman, Lady Hatt usually praises the engines for their good deeds.
Fun Fact!
Although we have never met Sir Topham Hatt's and Lady Hatt's children, we do meet their grandchildren during their vacation to the seaside.