Chinese firm Hollysys Automation Technologies will supply a subway signalling system for the Changping Line of the Beijing Subway network.
The $48m (RMB326m) contract has been awarded by state-owned rail operator Beijing Mass Transit Railway Operation.
Work includes providing engineering, procurement and construction services for the signalling system.
The 31.24km 11-station rail line extends north from Xi'erqi station on Line 13 to the Thirteen Tombs Scenic Area, linking the central Changping District with the Beijing Subway network.
The line's first phase is expected to be finished in 2010 and second phase in 2012.