Alstom will provide metro trains for five Paris underground lines, as well as for the future Grand Paris Express line, it said in a statement on Friday.
Alstom said the first firm order was for around 500 million euros for 35 eight-car metro trains.
"This should be followed by a second order for up to 37 trains for extensions to this line and then conditional options," Alstom said.
(Reporting by James Regan; Editing by Ingrid Melander)