The Railway Association of Canada and the Association of American Railroads initiated the Advanced Train Control Systems (ATCS) project in 1984. The railroads developed an operating requirements document and contracted a team of engineering firms (ARINC Research Corporation, Transportation and Distribution Associates, and Lapp-Hancock, Ltd.) to act as the system engineering team. The project then published a technology assessment, a number of draft specifications that defined a physical architecture, and a preliminary high-level assignment of functional requirements to physical components. It soon became clear that a method was required to document how the various components of ATCS should cooperate in carrying out railroad operations. In 1987, the first version of this documentation, known as Control Flows, was produced using the MacDraw software package and consisted of a set of high-level figures depicting the application logic. Since that time, railroad industry reviews have rapidly increased the detailed information contained in each flow. The project quickly outgrew the capabilities of the MacDraw tool as well as the flow chart format (Easy-Flow) and computer-aided software engineering tool (STATEMATE) that were subsequently adopted. The project abandoned STATEMATE in favor of ADA Syntax Program Design Language, which is readily convertible to software. Logic specifications written in ADA have been published and are designed to significantly reduce ambiguity, enhance maintainability, and provide a solid basis for future development by both the ATCS project and the supplier community.

Media Info

  • Features: Figures;
  • Pagination: p. 50-56
  • Monograph Title: Advanced Train Control Systems 1991. Proceedings of a Symposium
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00621427
  • Record Type: Publication
  • ISBN: 0309051517
  • Files: TRIS, TRB
  • Created Date: Apr 30 1992 12:00AM