The 25km line will link Keilaniemi, Otaniemi and Leppävaara in Espoo with Haaga, Pakila, and Oulunkylä in northern Helsinki before terminating at Itäkeskus in the east.
The 33-station line will closely follow the route of Line 550, Helsinki's busiest bus route with peak services operating at three-minute intervals. Line 550 carries up to 40,000 passengers per day, but the light rail line would accommodate up to 80,000, running largely on a segregated alignment with services operating at 5-10 minute intervals.
The project was approved in May after Espoo City Council approved revised cost estimates for the line.
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