Extending the red, orange, and yellow lines are together only going to cost a fraction (probably around $500 million) of what it will cost to build the full circle line ($3 billion+). I'm also in favor of a Clinton Street subway as well.
Someone mentioned a metra circulator downtown. I have my own ideas about that one, but the amount it would cost and logistics behind it would be enormous. #1, it would require construction of something similar to East-Side Access in NYC (which will bring LIRR trains into Grand Central through new tunnels). #2, it would require electrification of most, if not all existing and future commuter rail lines in the Chicago area, something I'd actually love to see.
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So am I supposed to sign something here?
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