Which one is correct and why?

In November 2002, Seattle voters approved the construction of a new 14-mile (23 km) monorail line, the "Green Line", which was to be the first of five monorail lines runningthrough the city.

OR

In November 2002, Seattle voters approved the construction of a new 14-mile (23 km) monorail line, the "Green Line", which was to be the first of five monorail lines running throughout the city.


Thanks in advance.