As seen earlier this morning.
As seen earlier this morning. Christopher Frizzelle

I went for a stroll to see what these tents are all about and found something called the "Welcome Portal."

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And workers putting up signage for the big opening tomorrow.

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The festivities at Capitol Hill and UW stations start at 9 am. The trains start running at 10 am.

How exactly did they construct Capitol Hill's underground light rail station? Here's how.