A professional who tends heating units that thaw frozen materials, such as coal and coke, in railroad cars. Respnsibilities include:

• Pushes buttons to start fuel-feed pumps, heater, and exhaust and air-volume fans.
• Lights oil burner, and opens valve of fuel line to heating unit in shed where cars are placed.
• Lubricates and adjusts equipment, such as pump and fan bearings.
• Cleans working area and equipment with airhose.