The merger that created Burlington Northern in 1970 and Amtrak’s assumption of intercity passenger service in 1971 brought significant change to BN’s roster of E-units. This culminated in 1972 with the sale of 21 E-units to the West Suburban Mass Transit District for use in Chicago-Aurora suburban service. Following a rebuilding program, these units provided almost 20 years of reliable service on the Chicago “race track.” Authored by noted Chicago commuter rail historian Bruce Nelson, this is the story of the last large E-unit fleet in regular service in America.