Expansion The ORGANIZATION@1 system had relied on its two main lines , namely the North South Line and LOCATION@1 , for more than a decade until the opening of the North East Line in NUMBER@1 .

Expansion The ORGANIZATION@1 system had been using its two main lines , the LOCATION@2 and LOCATION@3 , for more than ten years until the opening of the North East Line in NUMBER@1 .
