The 89.5-km railway section links Sighisoara to Coslariu (central Romania) and is part of the Pan-European Transport Corridor IV.
The EU-financed project aims to raise train top speed to 160 km/h for passenger trains and to 120km/h for freight trains.
The total value of the project is EUR884 million, of which EUR133 million represent national co-financing.
The project should be completed by end-2015.