Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, are generally required traction locomotive or winch. Coal narrow gauge mine car safety determination and decision rules: Connection tub at both ends must use standard plug. Plug and socket must be with anti-slip-off devices, hoppers, tub, latches shall not fall off during transport or lifting. Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, are generally required traction locomotive or winch. Use and management of the mine car: the tub is damaged in transit, are not allowed to park on both sides of the roadway. The use of tricyclic, bolts must be replaced when the wear exceeds 10 to 15% of the original size. Inclined (or uphill) to upgrade prohibited the use of the lock ring missing, loose boxes meet tub.