Under running crane is a suspension crane running under rails, it can be single girder cane or double girder crane. This crane can be used at power plants for coal grinding system, which is employed to maintenance coal grinding machine.

The under running bridge crane is a combination equipment composed of electric hoist trolley, main girder, deputy girder and under rail running device. Electrical system is controlled by button switch. This crane cannot be used to lift molten metals, toxic and explosive materials. The core parts of the cross-tracking suspension crane is the locking device. After turn on the track-locking, the crane tracks of 2 bays can be automatically locked with high precision, and electromechanical interlocking is safe and reliable.

The image above shows cross-track bridge cranes. The important features of this crane is that the hoists can travel across different bays by running across bridge crane track on the supporting beam. The 2 or more bridge cranes all have outstretched hoist track under the girder. Thus the bridge cranes is able to stop at the same level without gap to provide a horizontal line for hoist traveling smoothly between different bridge cranes of different bays.