Train performance and locomotive tonnage ratings calculated by digital computer

THE FUNCTION of a railroad is to provide transportation. But transportation to be satisfactory and attractive must be not only safe and dependable but must also be accomplished in a reasonable length of time and within the time shown in time tables. To accomplish this, adequate power must be applied to the trains. However, railroads cannot afford to be extravagant. Locomotives are expensive, and the bigger they are the higher the first cost and the cost of operation in wages, fuel, and maintenance.