Answer by taking a quote from the following article:

Carousel is the second musical by the team of Richard Rodgers (music) and Oscar Hammerstein II (book and lyrics). The 1945 work was adapted from Ferenc Molnar's 1909 play Liliom, transplanting its Budapest setting to the Maine coastline. The story revolves around carousel barker Billy Bigelow, whose romance with millworker Julie Jordan comes at the price of both their jobs. He participates in a robbery to provide for Julie and their unborn child; after it goes tragically wrong, he is given a chance to make things right.

The original Broadway production opened at the Majestic Theatre on April 19, 1945. The dress rehearsal the day before had gone badly, and the pair feared the new work would not be well received. One successful last-minute change was to have de Mille choreograph the pantomime. The movement of the carnival crowd in the pantomime had been entrusted to Mamoulian, and his version was not working. Rodgers had injured his back the previous week, and he watched the opening from a stretcher propped in a box behind the curtain. Sedated with morphine, he could see only part of the stage. As he could not hear the audience's applause and laughter, he assumed the show was a failure. It was not until friends congratulated him later that evening that he realized that the curtain had been met by wild applause. Bambi Linn, who played Louise, was so enthusiastically received by the audience during her ballet that she was forced to break character, when she next appeared, and bow. Rodgers' daughter Mary caught sight of her friend, Stephen Sondheim, both teenagers then, across several rows; both had eyes wet with tears.  The original production ran for 890 performances, closing on May 24, 1947. The original cast included John Raitt (Billy), Jan Clayton (Julie), Jean Darling (Carrie), Eric Mattson (Enoch Snow), Christine Johnson (Nettie Fowler), Murvyn Vye (Jigger), Bambi Linn (Louise) and Russell Collins (Starkeeper). In December 1945, Clayton left to star in the Broadway revival of Show Boat and was replaced by Iva Withers; Raitt was replaced by Henry Michel in January 1947; Darling was replaced by Margot Moser.  After closing on Broadway, the show went on a national tour for two years. It played for five months in Chicago alone, visited twenty states and two Canadian cities, covered 15,000 miles (24,000 km) and played to nearly two million people. The touring company had a four-week run at New York City Center in January 1949. Following the City Center run, the show was moved back to the Majestic Theatre in the hopes of filling the theatre until South Pacific opened in early April. However, ticket sales were mediocre, and the show closed almost a month early.  The musical premiered in the West End, London, at the Theatre Royal, Drury Lane on June 7, 1950. The production was restaged by Jerome Whyte, with a cast that included Stephen Douglass (Billy), Iva Withers (Julie) and Margot Moser (Carrie). Carousel ran in London for 566 performances, remaining there for over a year and a half.

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