High-speed "bullet" trains are operated by different national or regional entities depending on the country. In Japan, the Shinkansen network is operated by the various regional companies that make up the Japan Railways (JR) Group, such as JR Central (Tokaido line), JR East (Tohoku line), and JR West (Sanyo line). In China, the world's largest high-speed network is managed by the state-owned China Railway (CR). In Europe, the famous TGV is operated by SNCF (France), while the ICE is run by Deutsche Bahn (Germany). In Italy, there is a unique competitive environment where the state-owned Trenitalia (Frecciarossa) competes with a private high-speed operator called Italo. In the United States, the only current high-speed rail (by international standards) is the Acela, operated by Amtrak in the Northeast Corridor, though private companies like Brightline are expanding higher-speed services in Florida and the West. These operators are responsible not just for the trains themselves but for the specialized high-speed tracks, signaling systems, and dedicated stations that allow these "bullets" to travel safely at such extreme velocities.