This report describes an extension to the fleet-size model which was described in TRRL report LR607. The model relates fleet-size, which has an important effect on system costs, to the number of departures per day on an inter-city transport service, taking into account in a simple but realistic way the constraints under which a transport operator must plan his timetable. In the first part of the report, the mathematical formulation of the extension to the model is derived. In the second, the extended model is used to predict the number of trains required to run various services on a major railway network, and it is shown that the model gives good agreement with actual practice. This report is a supplement to LR607 (appendix 4) and should be read in conjunction with it. (Author/publisher)
Abstract