The total mileage of railways open to traffic in China amounts to 100,000 km, which form an extensive network with Beijing as the hub.Chinese railway service boasts domestic and international operations. The domestic service falls into such categories as quasi-high speed trains, fast trains, tourist trains, expresses and trough passenger trains.Quasi-high speed trains run mainly from Guangzhou to Kowloon and from Guangzhou to Shenzhen.Same-day fast rains shuttle between major cities.Tourist trains make the journey pleasant for those bound for major tourist cities. The sleeping carriages running on China's railways are partitioned into compartments each containing four cushioned berths arranged in upper and lower berths.