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GO Transit recently awarded a $32.9 million contract to Aecon Group Inc.’s Construction and Materials division to build a grade separation in Markham, Ontario.

The project calls for constructing a 0.9-mile concrete-walled open rail tunnel, which at certain points will pass under Canadian National Railway Co. tracks and a road.

Aecon will complete excavation and drainage work, tunnel and bridge construction and most of the utility work. The company subcontracted design work to a team headed by Totten Sims Hubicki Associates.

Construction will begin in late May and be complete in fall 2007.