20世纪后期巴西里约热内卢市郊铁路运营状况恶化,3 年内(1985～1998年),客流量从每天120万人急剧下降到14.5 万人。1998 年被迫私有化,由SuperVia 公司接管了里约热内卢市郊铁路网。近几年已投资4.91亿美元,更换了 26.7 万根轨枕和31 km钢轨,清筛和增补道碴并整治线路病害,修理 In the late twentieth century, the state of rail operations in Rio de Janeiro, Brazil, deteriorated. Within three years (1985-1998), the traffic flow dropped sharply from 1.2 million daily to 145,000. Privatized in 1998, SuperVia took over the suburban railway network in Rio de Janeiro. In recent years, it has invested 491 million U.S. dollars, replaced 267,000 sleepers and 31 km of rails, cleaned and added ballast and rectified line defects, repaired