Formalizing Train Control Language:
Automating Analysis Of Train Stations
Author(s)
A. Svendsen, B. Møller-Pedersen, Ø. Haugen,
J. Endresen & E. Carlson
Abstract
The Train Control Language (TCL) is a domain-specific language that allows
automation of the production of interlocking source code. From a graphical
editor a model of a train station is created. This model can then be transformed to
other representations, e.g. an interlocking table and functional blocks, keeping
the representations internally consistent. Formal methods are mathematical
techniques for precisely expressing a system, contributing to the reliability and
robustness of the system through analysis. Traditionally, applying formal
methods involves a high cost. This paper presents a formalization of TCL,
including its behavior expressed in the constraint solving language Alloy. We
show how analysis of station models can be performed automatically. Analysis,
such as simulation of a station, searching for dangerous train movements and
deadlocks, is used to illustrate the approach.
Keywords: interlocking, domain specific language (DSL), model analysis, alloy,
Train Control Language (TCL).
1 Introduction
An interlocking system prevents dangerous train movement on a train station by
giving a \“clear” signal to a train only if the requested route is safe. The
interlocking system ensures that the route is safe by reading the status of the
elements in the route (e.g. tracks, switches, signals) to see if they comply with
the logic of the interlocking system. This logic is depicted by an interlocking
table, and realized by the interlocking source code, in the form of functional
Keywords
interlocking, domain specific language (DSL), model analysis, alloy,
Train Control Language (TCL)
Related Book
Other papers in this volume
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