Before the CTA introduced colored line names in the 1990s, trains from Howard used to run to Jackson Park/63rd using that portal. In the 90s, CTA built a new subway tunnel between Roosevelt and Cermak-Chinatown, allowing for today's Red Line service from Howard to 95th.
After this rejiggering, the old subway portal was no longer needed. Now it's just used to switch cars between yards, or for temporary reroutes due to emergency or construction on the Loop tracks.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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