I flew over the entire Niigata Kotsu Electric Railway Line in the virtual world of Google Earth.
If you're also interested in the Shinano River, please see below.
• 【千曲川・信濃川 】Google Earthで巡る河川
You can also see the Okawazu Diversion Channel (16:54), which was a major factor in reducing the water volume of the Nakanokuchi River, the point where it branches off from the Nakanokuchi River (17:24-31), and the point where it merges with the Nakanokuchi River (19:26-39).
Wikipedia information: https://ja.wikipedia.org/wiki/Niigata...
Below is an old map I used as reference.
Aerial photograph 1974-1978https://maps.gsi.go.jp/#13/37.850111/...
Map of Then and Now 1981-1988https://ktgis.net/kjmapw/kjmapw.html?...
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The Google Earth animation was created using #GoogleEarthStudio.
The 3D train model was created using Blender.
The 3D train model was based on the Odakyu 2200 series train model from "Saha 209." (It was slightly modified and repainted.)
The audio was provided by "Easy! AITalk3."
The background music is from the YouTube audio library.