I read McCullough's The Thorn Birds and then watched the mini-series on television, which became the second most watched mini-series (behind Roots). She went on to write more novels.
Doctorow's tale is from the Great Depression when a young man finds himself alone and cold by a railroad track and sees a train go by with intriguing people inside two of the cars. He follows the track to an estate at Loon Lake.
Terry Pratchett suffered from early onset Alzheimer's Disease, which eventually took his life. Mort, the novel that I read, was a rip-roaring ride of satire through an imaginary flat discworld. In fact, he wrote an entire series titled Discworld.