Double girder gantry crane is used together with electric trolley as lifting device traveling on the railway with high space utilization and heavy strong structures. It is mainly composed of two main beams, electric trolley, two ground beams and four legs, the power is supplied by cable or slide wire. This kind of crane is widely used in open storage, loading and unloading operations yard, railway freight station, port cargo area, where it has a high frequency or more lifting times. Parameters feature: Lifting capacity: 5~500t Span: 18-35m Lifting height: 10/11m Lifting speed:7.2m/min ~ 11.4m/min Trolley traveling speed: 34.5m/min ~ 47.1m/min Crane traveling speed: 38.3m/min ~ 44.6m/min Work duty: A5-A7 Work temperature: -20°C-+40°C Control method: Remote control or cabin control