At the time of its creation in 1965 for the Southwestern Illinois Coal Corporation, the Marion 6360 was the world’s largest mobile land machine; with ballast it weighed 28 million pounds. Working around the clock, seven days a week, it helped deliver approximately 150 railroad carloads of coal a day, moving overburden 270 tons at a pass. The two hoist drums, containing more than a mile of wire rope, were driven by eight 1,000 hp electric motors, the largest ever used in an excavator. Four 3 1/2-inch wire ropes hoisted the dipper through a two part hitch. Four motor generator sets converted 14,000 volt AC power to direct current for twenty main-drive motors capable of 30,000 horsepower output. The shovel propelled itself at 1/4 mph. Each crawler was 45 feet long and 16 feet high. Each crawler shoe measured ten feet across and tipped the scales at 3 1/2 tons. The 180-cubic-yard dipper measured 24 feet from teeth to door.