That\'s the CN\'s (formerly Soo Line, and before that, the old WC) Altenheim sub. Not used much anymore, as CN has so many other lines they own. It\'s the same line that runs along the south side of the Eisenhower, but at that point the tracks belong to the B&OCT. Around Forest Park you can see one of the tracks is being used for storing cars. The CSX still uses the line west up to the Ferrara Pan factory between Harlem and Circle.