Despite being a medium capacity system, at 3.2 meters (10 ft 6 in),[5] they are ironically the widest trains in South Korea.

[8] Initial forecasts from 2001 expected daily ridership to reach 140,000 people per day at the time of opening.

[2] However, later estimates revealed that this number would instead be closer to 32,000 riders per day due to the improvement of existing transportation options and construction delays on the Suin–Bundang Line at Giheung station (which would not open until 2011).

[2][7] As a result, the city government of Yongin was ordered to pay the consortium ₩7.79 billion in compensation at the behest of the International Chamber of Commerce.

[7] South Korean authorities investigated possible corruption by Bombardier Transportation officials over the building of this line and concerns that ridership was exaggerated to have the technology preferentially chosen over other contenders.

No charges were filed due to a lack of presented evidence and the case reaching its statute of limitation.