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That report is now 13 years old and as true today as it was then, and true to 150 years ago, too.  The basic technology matured a long time ago.You can build a good railway for passenger, or you can build one for freight, but it is difficult to do both if cost control is an objective.  Historically railroads did both but in an environment where cost of inputs was low and cost of service was high.  Today the situation is reversed.  Operating trains of different speeds on the same track results in lower realized capacity than if all trains are the same speed.  Methods for solving this problem all increase the cost of input (e.g., increasing hp/ton ratios on freight trains). S. Hadid
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