JUDUN hydraulic jacks, crimping pliers, and pumps are used in metro operation and maintenance—supporting rail leveling, bogie lifting, power cable crimping, and turnout component replacement in narrow tunnels and depots where no external power source is available. In emergencies such as train derailments and passenger entrapment, these tools can lift car bodies and remove obstacles quickly. They provide reliable hydraulic support for both routine maintenance and emergency response in urban rail transit.