Table of Contents:

Introduction

Background Information Selection of System

Characterisation of System under Study Systems Objectives/Purpose Environment Sub-Systems Objectives/Purpose Elements of the Sub-Systems and their Attributes System Relationships System: Between Each of its Sub-Systems Sub-System: Between Each of its Elements System Complexity Dynamics of System

Problem/Challenge Identification Problem/Challenge Description Problem Context Stakeholders/Players

Selection of System Methodology Hard versus Soft Systems Methodologies

Application of System Methodology Brief description of the systems methodology Examination of Each Stage in the context of the problem/challenge Stage 1: ……………………….. Stage 2: ……………………….. Stage 3: ……………………….. Stage N: ……………………….. Implementation Issues

Conclusion

References

Introduction

This paper briefly explains the formation of a simple railway line control system as well as relationships between its subsystems. A simple railway line control system is formed by switch boxes along the track as well as the on board train control computer, while a simple railway line means a single track branches into two separate tracks for trains to pass each other, then immediately joins together. (Figure 1) The main control system consists of three subsystems which include safety, control as well as interlocking system. A real life example of a simple railway line can be found in North of Denmark (from Hillerod to Tisvildeleje) which is a privately owned railway with low traffic density.

[pic]

Figure 1: A simple railway line

Characterisation of system

System Objectives
The purpose of the railway control system is to ensure the safety of trains by preventing events like collisions, derailing as well as deadlock of trains (Figure 2,3). Deadlock of trains is preferable