Working in the subway several hours each day, subway workers and transit police breathe more subway air than the typical commuter. (ldeo.columbia.edu)
Early in the morning of New Year's Day, 2009, Oscar Grant was fatally shot in the back by a Bay Area Rapid Transit police officer at an Oakland, Calif., station. (seattletimes.com)
Maple was introduced to William Bratton, a former top Boston cop who'd been brought to New York to become the Chief of the New York City Transit Police in 1990. (techcrunch.com)