Washington’s historic income tax is now law. But Republicans promise challenges

It took years to float a train over Lake Washington. Here's how it works

Opening the light rail across Lake Washington over the weekend was an historic moment. Trains go across bridges regularly, but never before has there been a train over a floating bridge. Engineers worked on the challenge for years.  We’ll hear why it’s so complicated and how engineers pulled it off from University of Washington professor Travis Thonstad.