An available ton mile is a calculation in aviation based on the tons of carrying capacity multiplied by the number of miles travelled.
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A ton-mile is a unit of measure that represents the transport of one ton of freight over one mile. The energy associated with a ton-mile can vary based on the mode of transportation, but a rough estimate is that it takes about 0.5 to 1 megajoule to move a ton over a mile. Therefore, a ton-mile is generally equivalent to approximately 0.5 to 1 megajoule, depending on the efficiency of the transport method used.
A 50-ton payload traveling 1,000 miles means that you have accomplished 50,000 ton-miles. Just figure out what it cost you to haul that load for that distance, divide the number by 50,000 , and you have your cost per ton-mile.
25 tons transported 55 miles = 1375 ton miles @ 15 cents per ton mile, that would be 1375*0.15 = 206.25 Euros or Dollars or whatever.
Rail
The English system is inch, foot, yard, mile for length. Mass (like weight) is ounce, pound, and ton. 12 inches in a foot 3 feet in a yard 1,760 yards in a mile 16 ounces in a pound 2000 pounds in a ton