Development of Delay-Based Base Train Equivalents for Multiple-Type Train Operations
Date Issued
2012
Date
2012
Author(s)
Lin, Tzu-Ya
Abstract
A conventional railway system usually has multiple types of trains with various service patterns operating on the same line. This difference in train characteristics lead to different capacity impacts on the system. Recently a new concept was proposed to use Base train equivalent (BTE) standardize different train type into base train; this concept is similar to Passenger car equivalent (PCE) on highway. By convert these non-base trains to a standardized unit we call the convert volume as base train units (BTU). However, previous study focuses on the development of BTE with analytical capacity models as opposed to delay-based capacity models, such as parametric or simulation models. Consequently, this research develops delay-based BTE models for delay-based capacity models.
Since BTE is developed based capacity models its value also varies with key capacity factors, such as traffic, operating and route characteristics. However, in terms of a particular route, BTE would only vary with traffic volume and heterogeneity since most of the other factors will be fixed. Therefore, this study first develops dynamic BTE models with consideration of volume and heterogeneity. Besides that, this study also develops fixed BTE model with consideration of heterogeneity since its impact is far more significant than traffic volume.
Another variation in the development is the number of train types. For only two-type train operations, BTE can be directly computed based on the developed BTE models. However, the same model cannot be directly applied to multiple-type train operations (three or more types) due to due to limited output of variables from the capacity models. This study adopts the concept of vector projection to identify single value for each BTE in this case.
With the proposed models, the unit of delay-based rail capacity can be converted into a standard unit. The impact of an additional train can be easily assessed, and capacity measurements from different lines or systems can be compared and evaluated.
Subjects
Base Train Equivalent
Capacity Analysis
Capacity Factor
Simulation Mode
Train Delay
Type
thesis
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