The detailed design is complete for the Purple Line and waiting for approval to go ahead with construction, according to a senior official from Parsons Brinckerhoff.
The company is the project consultant and is, meanwhile, also looking at the possibility of a rail network in Oman, he said.
"We have gone through a process of defining the route more in detail and making it much more attractive to the Roads and Transport Authority (RTA) and passengers. We are just waiting for the go-ahead on construction," said Stuart Wallace, Managing Director of Parsons Brinckerhoff Middle East.
"We could go to tender by mid-May but that will depend on the RTA and when they want to start."
In May 2007, the RTA signed the agreement with Parsons to carry out consultancy services, including the initial designs of Dubai Metro Purple line.
The project completion is expected in Q4 2013.
The 49km Purple Line is the third line of the Dubai Metro project and will provide an express means of transport that provides a direct link between Dubai International Airport and Jebel Ali Airport. It will be followed by the Blue Line.
He said the company is continuing to see growth in the rest of the GCC – in Oman, Qatar and Saudi Arabia. "In Oman, we are looking at a rail project as well as roads and major port developments." Iraq is another prospective market.