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The contract covers 12km of tram line, utility installations and electrification, supporting urban growth and connectivity.
The Pfaffensteig Tunnel, spanning 11km, will be built as a twin-bore tunnel, each containing a single railway track.
Officials marked the start of major upgrades to the I-71/I-75 corridor connecting Ohio and Kentucky.
DLA Piper advised on deals worth $10.5bn during the quarter.