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Rail transport becomes an important basis industry and the backbone of the integrated system for its higher safety, speed,longer distance, large capacity, low cost, and lower affected by weather. Based on the larger population and goods demanded, we always can see "difficult to get a ticket" and accumulation of goods. In a market economy, the railway sector on the one hand to complete the transport task of good quality to meet market demand for transport, but we also need economic and rational use of rolling stock and other technical equipment.According to Railway mobile equipment purchase for different reasons, is divided into the acquisition and updating new purchase. New acquisition in two parts of which: railway transport enterprises from the existing supply capacity and passengers, shippers transport needs two angles. With the break-even principle, from the perspective of transport enterprises, the establishment of demand model to calculate the demand, transportation costs and transportation income derived function derived from the demand point of purchase of railway transport number of new enterprises; demand on transport demand through the forecast, the calculation trains on the line for the opening number of the vehicle turnaround time trains need to calculate the number.Take the railway wagons for example, calculating the number of railway wagons overhaul cycle, focuses on the overhaul cycle determined. Analysis of rail vehicle overhaul cycle factors:the basic depreciation, maintenance costs, repair costs section, plant repair costs and loss of parking fees, the establishment of overhaul cycle model, based on the minimum cost per unit of time thinking, taking into account the physical life of the vehicle, calculate the economic overhaul railway wagon repair cycle times, come to update the rolling stock and reasonable point.
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