This day, 7 March, 1999, Iran’s first electrified railway, the Tehran-Karaj Railway, built by a Chinese company, was officially put into operation. With a total length of 41 kilometres, of which 31.5 kilometres were opened initially, the Chinese side was responsible for the mechanical and electrical system design, equipment supply, installation and commissioning of the link.
这一天，1999年3月7日，伊朗第一条电气化铁路德黑兰-卡拉吉铁路，由一家中国公司建造，正式投入运营。 总长度为41公里，其中最初开放了31.5公里，中方负责连接的机电系统设计、设备供应、安装和调试。
