The first phase of the Metro D Line extension opens Friday, a project that’s been decades in the making. Kavish Harjai takes us through the history of what was originally known as the Wilshire Boulevard subway.

<p>The first phase of the Metro D Line extension opens Friday, a project that&rsquo;s been decades in the making. Kavish Harjai takes us through the history of what was originally known as the Wilshire Boulevard subway.</p>