^ Bingo. In the case of Clark Junction, the flat junction constrains capacity more than the stations and signals. Problems at Clark Junction don't require a new subway line to Ravenswood and Albany Park.
I'm not saying there aren't parts of town that could use a new rail line, but it's a cost/benefit thing. We don't have any Second Avenues or even any Wilshires that justify a multi-billion dollar subway. We have lots of places to justify $100 million BRT lines.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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