More than 4,000 kilometers of new railway lines were put into operation last year, bringing the total network of China's railway system to 155,000 km, with 42,000 km being high-speed railways, according to the national railway operator China State Railway Group on Tuesday. Last year, the sector built more railway infrastructure to stabilize economic growth despite the downward pressure on the economy caused by the epidemic and external challenges. A total of 4,100 km of new railway lines opened to traffic last year, and 2,082 km were high-speed railways, Liu Zhenfang, president of the company, said at the company's annual conference in Beijing. (....)