JNR Class DD51, (one type of engine said to be the responsible for the recording) with 24 series coaches as a part of crew training. It is extremely rare since the mid-2000s.
JNR Class ED79, (other type of engine said to be the responsible for the recording) running along the coastline - Japan Sea Main Line, etc.
This is an anime sound effect. The whistle was heard from a Japanese National Railway air whistle (AW-2) sourced off from following two diesel locomotives: JNR Class DD51, and JNR Class ED79.
