Excerpt from The British Railway Position: Reprinted From the Statist
The inherent vice of the train - mile unit is its uncertainty. As a standard of measurement a train is little better than the historical lump of chalk. One train may carry 600 tons, or, in America, perhaps tons of paying freight, whilst another train may consist of two small waggons, with two tons in each waggon, run at a loss under the incentive of keen competition. In train-mile statements each of these trains are treated as if they were identical. Hence, whilst train-mile figures are most useful - essential, indeed, for some purposes - they are, for other pur poses, utterly unsound and worthless. Why should not, both ton-miles and train-miles be used according to their respective values for the purpose in view at the moment? Surely in selecting a statistical unit for any statement it is invariably right to choose the best that is available.
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