The Station Demand Forecasting Tool (SDFT) generates a demand forecast (predicted trips per year) for one or more proposed local railway stations (a local railway station is considered to be a Network Rail category E or F station). If required, the tool can also produce an analysis of potential abstraction of journeys from existing stations, enabling the net impact of a new station on rail use to be estimated. Forecasts for multiple stations can be accommodated as part of the same job. These can be treated independently (alternative station locations are to be assessed) or concurrently (the proposed stations will coexist).
The underlying model is based on research by the University of Southampton’s Transportation Research Group. At its core is a national trip end model which has been calibrated on the smaller stations in Great Britain. In this type of model the number of trips is a function of the population in a station’s catchment and a range of other variables, such as service frequency and number of jobs nearby. A novel aspect of this model is that probability-based catchments are defined using a station choice model applied at the unit postcode level. Rather than assuming everyone will use their nearest station, this provides a more realistic representation of behaviour and allows competition to occur between stations.
The SDFT is well-suited to the rapid and inexpensive assessment of a number of potential station sites as part of an early sifting process. For example, the underlying model was used to forecast demand at 12 potential new stations in Wales as part of the Welsh National Transport Plan. Even in cases where local or regional government or transport authorities decide to commission their own bespoke studies, the SDFT can be used as a sense-check tool. For example, if demand forecasts produced by the local model and the SDFT differ by an order of magnitude, this would be a clear warning that the local models may not be reliable.
The SDFT also has the potential to democratise the planning process by opening up the ability to produce forecasts to a much wider range of stakeholders, empowering local campaign groups who can often feel powerless when arguing against official forecasts that they believe to be unduly pessimistic.
Generating a demand forecast using the SDFT involves a series of data processing and spatial analysis steps with a high computational requirement. As the model has been coded to take advantage of parallelisation, the length of a model run will depend on the number of available processor cores.
An article about the tool, setting it in context, appeared in Issue 165 (October 2020) of Railwatch (the quarterly magazine published by Railfuture).
The SDFT is an open source project hosted on GitHub. An easy Docker install is available.