Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, large-scale transport tub processing, generally required traction locomotive or winch. Coal narrow gauge mine car safety determination and decision rules: tub only allow loading coal, gangue and production materials, large-scale transport tub, as a result of the need to load other materials, when equipment, large transport tub manufacturer, its load length, height can not exceed the edge of the tub box. Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, are generally required traction locomotive or winch. Harvesters inspection criteria: Bearing fit. Axle journal wear can not use knurled or casement repair. Axle shall not exceed the maximum bending 1mm. Wheel fixed to the frame, and the shaft seat block hoop gap no larger than 5mm. Wheelbase tolerance must not exceed 2mm. Two axes should be perpendicular to the longitudinal centerline frame.