The Brown Line of the Chicago L system, is an 11.4-mile (18.3 km) route with 27 stations between Chicago's Albany Park neighborhood and downtown Chicago. It runs completely above ground and is almost entirely grade-separated.
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Boston's subway was the first in the United States and is often called America's First Subway by the MBTA and others. In 1897 and 1898, the Tremont Street subway opened as the core of the precursor to the Green Line. In 1901, the Main Line Elevated, the precursor to the Orange Line opened.
In fact, the L has been safer than ever over the past five years since the Chicago Transit Authority's much-publicized expansion and installation of a $26 million surveillance network consisting of 3,600 cameras on rail cars and platforms.