These trains have different performance and operating characteristics and therefore the train control system is extremely complex.įigure 1 – West Side Rail Yard for LIRR Trains, Looking East to Penn Station.
The Northeast Corridor between Washington, DC and New York is a mostly four track rail line with over 50 interlockings 2 and is used by Amtrak regional service, Amtrak intercity, the high speed Acela express and several long distance trains, as well as New Jersey Transit and SEPTA services. Two of the most recent models will be used as examples: the models of the Northeast Corridor 1 and the Long Island Rail Road. This article discusses only one component of railroad simulation modeling input – signal train control, specifically the accurate representation of train control systems and Positive Train Control (PTC).
Generally, rail and transit simulations have three major types of input: rail infrastructure, signal train control, and schedules.
Large models take longer to develop, they are more difficult to manage and it takes longer to obtain and process results. While computer simulation is an excellent tool for analysis and planning and it is recommended completing as much modeling as possible before starting a railroad improvement program, simulations have some limitations. It is critical that all simulation results be carefully reviewed and discussed with those familiar with operations. The proper assumptions have to be made about degree of reduction of insignificant features and their applicability to support project goals. Models typically represent only a portion of a network and they simplify features that are not relevant to the specific purpose of a project. This should accurately replicate railroad operations with the existing infrastructure, rolling stock, and schedules. The first step in using computer models in railroad planning is to build and calibrate the base case model. In general, the more modeling done up front, the less expensive the overall project will be, since modeling enables the plan to be refined to its most essential elements. Railroad simulation modeling of signal train control, specifically the accurate representation of train control systems and Positive Train Control (PTC), is discussed using the Northeast Corridor and the Long Island Rail Road as examples.Ĭomputer simulation is a particularly important and useful tool for evaluating different railroad improvement strategies.
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