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49 1. Extension of the research to other types of LFLRV, includ- ing 100-percent low-floor and steering single-axle trucks with IRWs. Linked to this is the issue of the validity of the â2 gâ crashworthiness approach, which may be inhibiting the implementation of other types of LFLRV in the United States and Canada. 2. Detailed analysis of the operation of IRWs through different types of U.S. and Canadian designs of switches and crossings, including single-point switches. This would include the design of switches to accommo- date optimized wheel and rail profiles suitable for IRWs. 3. Development of a set of standardized wheel profiles and matched rail profiles. These might have a fixed flange con- tour with adjustments for flange height and the presence or absence of flange tip running. A recommended flange- to-tread transition should be specified, as well as the end of the tread contour. Wheel width would be variable, based on requirements. Compatibility of such a standardized wheel profile would be studied in relation to the rail pro- files of existing systems and the performance requirements of existing vehicles. 4. Development of a âtotalâ optimum solution for a âfresh startâ system. C H A P T E R 5 Recommendations for Further Research
