Platforms for local trains are 920 mm high, and ones for Shinkansen bullet train are 1,100 mm high. Platforms for commuting trains in large city areas are also 1,100 mm, so when trains designed for these areas arrive to a platform in local train area, there is a gap from the platform to the floor of the train car. In the past platforms used to be 760 mm high, but most platforms of JR line is either 920 mm or 1,100 mm high. When riding on a local train, you usually have to climb one step inside the car from the entrance to the main floor of the train. A new train which has been introduced recently is designed as barrier-free train, has low floor, and has no gap from platform to the floor of the train. Barrier-free train design is desirable, but managing two heights of the platforms may be preventing the train carriers from realizing it.