SEATTLE — Officials took another step toward eventually connecting much of the Eastside with downtown Seattle on Monday night when they ran a live test of a Link light rail vehicle going over the Interstate 90 floating bridge on Lake Washington.

The live wire testing of a single light rail vehicle was conducted by Sound Transit late Monday night. The vehicle tested the power systems of the two stations that eventually will allow travelers to ride the light rail from Seattle to Redmond through the 2 Line extension .

The Judkins Park and Mercer Island stations are fully built but the electrical systems and tracks themselves are still in the testing phase. The live wire testing phase is expected to last several months and will be followed by the signal testing phase.

The test comes just

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