Mid summer is prime time for big transit openings, and this weekend is a doozy. Three big projects around the US are opening today or tomorrow.

Silver Line. Photo by Fairfax County.

Denver Union Station. Photo by Ryan Dravitz for DenverInfill.com.

Tucson streetcar. Photo by Bill Morrow on Flickr.

By now, probably everyone in the DC region knows the Silver Line opens tomorrow, Saturday the 26th.

The same day, Denver’s gloriously updated Union Station opens its final component, the renovated historic main hall. Other portions of Denver’s Union Station opened in May.

But Tucson beats both DC and Denver by one day. Their Sun Link streetcar opens today, at 9:00 am Mountain Time (11:00 am Eastern Time). Sun Link uses the same streetcar vehicles as DC’s H Street line, built by the same company, as part of the same production run.

Speaking of the H Street streetcar, although it’s not opening this weekend, it is nonetheless making visible progress. The final streetcar vehicle has finally arrived in DC from the factory. Four streetcars are now on H Street for testing, plying the route on their own power. And pylon signs are starting to appear at streetcar stations.

All these projects have been a long, difficult road. It’s great to see them starting to pay off.