On January 18, the first phase (northern section) of Tianjin Rail Transit Line Z4 was officially entered service. The trains, custom-built by CRRC Dalian Co., Ltd., support regional coordinated development and contribute to the construction of a rail-connected Beijing-Tianjin-Hebei region.
The trains consist of six Type-A aluminum-alloy cars featuring high strength, light weight, and resistance to corrosion. With a maximum operating speed of 120 km/h, the trains are well suited for rapid urban commuting and regional connectivity. Two accessible cars are available on each trainset, equipped with wheelchair securing devices and a passenger call system.
The trains are equipped with multiple independently developed innovative systems. The online pantograph-catenary monitoring system enables real-time diagnostics of the overhead contact system, enhancing power supply safety. A regenerative braking energy feedback system converts braking energy into electrical energy for enhanced energy-efficient operation. An intelligent lighting system automatically adjusts brightness based on ambient light, improving passenger comfort while reducing energy consumption. In addition, running gear and battery health management systems provide round-the-clock condition monitoring and early warnings for key components, further securing operational reliability and efficiency.
