Barrington grew slowly at first, adding five more stations between 2004 and early 2006.
"We don't know how you could add more stations."
The extension will add 13 new stations and 17.7km of new track.
This extension involved adding 3 more stations in the line.
In 1969, the department expanded again for the final time adding two more stations.
There are plans to add two more stations omitted during initial construction for cost saving reasons.
The extension added eight new stations and seven park-ride lots.
It will add 2 stations and 1.6 km of additional route length.
The $2.5 billion project includes two new lines, adding more than 12 miles and 21 stations.
It will then add at least 100 more stations a year for the foreseeable future.