Alstom will supply signalling and telecommunication technology for the 25km Vigo-Portela section of the new Atlantic mainline in Spain.
The €16.5m contract has been awarded by Spain's Ministry of Transport.
The company will provide electronic Smartlock points, signal lights, track circuits, telephone communications, power supply and technical premises for the rail section.
The equipment will allow trains to operate at up to 200kph and is aimed at reducing journey times and increasing the line's capacity and safety.
The high-speed Atlantic mainline rail corridor runs from North East Spain to the Portuguese border.