Yes, you can ride the Hogwarts Express, but it requires a very specific type of ticket at the Universal Orlando Resort in Florida. Because the train travels between "Hogsmeade" (located in Universal’s Islands of Adventure) and "Diagon Alley" (located in Universal Studios Florida), you must have a Park-to-Park ticket to board. You cannot ride the train if you only have a single-park admission. The experience is different in each direction: the journey from King's Cross Station in London to Hogsmeade features different digital "window" projections and sound effects than the return trip, so many fans ride it twice to see both versions. The attention to detail is immense, from the "vanishing" effect through the brick wall at Platform 9¾ to the shadows of Dementors in the hallway. Note that there is a "Hogwarts Express" at Universal Studios Japan and a static version at the Studio Tour in London, but the Orlando version is the only one that actually functions as a working transport system between two different theme park lands, making it a "must-do" for any Harry Potter fan visiting the Florida parks.