Foreword

s 1. "A Comparison of Safety Considerations for High-Speed Rail and Maglev Systems," Paul Taylor, 70th Annual Meeting, Transportation Research Board, 16 January 1991. This is a bulledzed viewgraph presentation comparing the safety issues for high speed rail and maglev systems. Overviews of the TGV wheel-on-rail and Transrapid EMS maglev systems are given with descriptions of those features which impact safety. The safety risks are delineated, providing a basis for developing tests to improve safety and mitigate risk. Safety issues for maglev include vehicle structural strength, braking, communications, control, guideway structure and maintainability, degraded-mode operations and emergency procedures. 2. "A Systems Approach to Safety from the Top Down," John A. Bachman, Presentation at Session 180: High Speed Rail and Maglev Safety Implications, Transportation Research Board Annual Meeting, 16 January 1991. This presentation addresses the need for a system approach to high-speed ground transportation (HSGT) safety and outlines one potential methodology to illustrate the approach. By system approach it is meant that safety issues must be addressed during the planning stage and addressed from the highest level of a system hierarchy, downward. Specific planning should take place during the early stages of project preliminary design engineering. This is a departure from the traditional domestic approach of employing safety issues individually, for example, dependence on vehicle strength in isolation of other factors. Traditional specific domestic safety codes are not to be ignored, but their relevant importance to overall system safety objectives should be examined. There are six basic ideas conveyed in this paper as follows: • Integrate safety planning into HSGT system design • Define HSGT architecture • Identify critical interfaces • Structure interfaces schematically • Address formulation of HSGT safety standards at segment and element levels • Quantification and evaluation methodology is required 3. "Aero-Acoustic Investigations of the Magnetic Train Transrapid 06," Hans Alscher, International Conference on Magnetically Levitated Systems and Linear Drives, Maglev 89, Yokohama, Japan, Document No. UW-0009-89-PUB=OTN-031019, 7-11 July 1989. Minimizing aero-acoustic noise and aerodynamic drag are major aims in the development of high speed trains. For this purpose, dominant sources of aero-acoustic noise were identified on the surface of the magnetic train Transrapid 06 by microphone-array measurements. Dominant sources were the gaps between car body and bogies between the two cars of the train and a specific region near the nose of the train. The gaps are of no further interest, as