Some Kyushu Shinkansen line services in southwestern Japan will adopt dynamic pricing for advance tickets after a recent trial eased congestion, the operator said Tuesday, becoming the first bullet trains in the country to use the system. The change applies to online sales of tickets for journeys starting July 1 that are purchased between a week and a month in advance for travel between Hakata Station in the city of Fukuoka and Kumamoto Station in Kumamoto Prefecture, said Kyushu Railway Co., also known as JR Kyushu, said. As a result, customers will pay one of three prices — 4,200 yen ($27),…