Abstract
Chicago’s light rail rapid transit system is known as the L. The city of Chicago has the oldest standing tracks in the country with some portions of the system dating back to the 1880s. The noise of the L is a signature mark of Chicago and has long been dealt with by residents due to the integral nature of the transportation system to the city. The paper outlines what the CTA (Chicago Transit Authority) planning and development office defines as the four major sources of noise, and how they deal with the issues. Among these are thump, roar, rumble, and squeal. These issues are dealt with through rail grinding programs, wheel truing, and structural improvements, as well as wheel dampening rings, rail lubrication, and reconstruction projects to reduce the steepness of curves. A before and after study of one of the recent CTA construction projects was done to see if these goals are being met by the reconstruction projects being performed in the field. The CTA has agreed to cooperate with me in this project; the Vice President of planning and development has offered data and the CTA approval of the independent study.
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