Although a lot of long-distance trains that run nearly the entire line were seen during the era of the Japan National Railway, currently operations are done on the basis of sections divided in pieces, as shown below.
国鉄時代は、ほぼ全線を通して運転されるような長距離列車が多く見られたが、現在は概ね下記の区間に細かく運転系統が分かれている。