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... Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 7 of 61 1 Introduction The topic of energy use continues to expand in importance as conventional energy sources diminish and as concerns over environmental affects related to energy use escalate as do concerns for the cost of energy. Public transportation agencies, and in particular electric rail transit systems, the subject of this report, are examining a diversity of approaches to improve operating efficiency, reduce energy use, and improve operational effectiveness.

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