This report takes into account the inherent differences and similarities between trolleybus and light rail systems. Chapter 1 provides an introduction and describes the function of overhead contact system (OCS) for trolleybus and light rail systems. Chapter 2 describes nonintrusive and intrusive designs. Chapter 3 discusses the influence system design has on visual impact including the need for emergency wire and the use of one-way operation to minimize visual impact in trolleybus systems, the provision of turning capability in trolleybus and light rail OCS design, and the effect of curve design and the design of the electrical distribution system on the appearance of light rail OCS. An approach to evaluating the visual impact of trolleybus intersections is presented. Chapter 4 describes the types of suspension used in trolleybus and light rail OCS. Chapter 5 identifies the type and amount of hardware required for various trolleybus curves. It also describes approaches to light rail curve design that differ in the amount of supporting structure used. In Chapter 6 the discussion of intersections in Chapter 3 is expanded. Chapter 7 describes the visual impact of OCS elements. Chapter 8 illustrates the ways in which streetscape improvements can be used to enhance the visual quality of OCS through design, landscaping, and the consolidation of street-furniture elements. Chapter 9 discusses the advantages and limitations of presenting OCS designs using photographs, technical plans, architectural renderings, and reproductions of computer-generated images. Chapter 10 describes the complexity of the regulatory environment for transit projects using OCS. Chapter 11 contains the conclusions of this research effort of which the primary conclusion is that the visual impact of OCS can only be reduced if such reduction is made a specific goal throughout the design process. Appendix A is a glossary of terms, and Appendix B is a list of trolleybus and light rail systems in the United States and Canada.
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