... gauge 3.frequency change 4.one year warranty Name: 12T narrow gauge frequency change mine locomotiveModel No.: CJY12/6GPTrolley locomotive:Locomotive using DC ... of coal, metallurgical industry, mining, forest, railway, road tunnel construction and etc.Locomotive can be used elevation within ... to DC driving.5. The products can adapt mining working environment, accepted temperature within -40°C~+50 ...