A professional who assists car repairer in repairing and rebuilding freight cars, tank cars, or locomotives, performing any combination of following tasks. Respnsibilities include:

• Threads nuts and bolts and drills metal stock, using hand taps, dies, and drill press.
• Shears metal sheet and bar stock to specified dimensions.
• Straightens metal parts, using hammer and sledge.
• Bolts steel top frames to side frames of car, using power wrench.
• Rolls axle and wheel assemblies into hydraulic wheel-dismounting machine.
• Pulls levers to position ram against end of axle and force wheel from wheel seat.
• Rolls wheel to storage area.
• Caulks seams of car and fills car with water to detect leaks.
• Polishes brass trim on car.
• Repairs or replaces steam and airhoses.
• Lubricates car.
• May be known according to specific task performed as Car Tester; Car-Top Bolter.
• Performs other duties as described under helper master title.