http://www.railwaygazette.com/news/passenger/single-view/view/korail-orders-260-kmh-emus.html
South Korea as well as Japan operate high speed trains at high frequency.
In order to live up to high frequency service, rapid acceleration and breaking systems must be installed on each train ,and then multiple traction units train is more appropriate for these countries than single traction train.
I don't understand why KTX initially adopted TGV's single traction train.
