https://forum.paradoxplaza.com/forum/developer-diary/hoi4-dev-diary-traiiiiins.1489330/ trains win wars it seems.
YES! Finally! The Millennium Dawn mod will be interesting with trains :P Barb (Short for Barbarossa, for those who don't know) will be a really fun offensive to play after this.
TSW2: Hearts of iron 4 update. Only focusing on infrastructure as Japan so you can progress to having Shinkansen as fast as possible.
That would be a very cursed Timeline "Chinese Forces have attacked a Shinkansen service crossing the Marco Polo Bridge; The IJA (Imperial Japanese Army) has been deployed to take action" - Emperor H.
"fortunately this did not affect the on-time ratio of the Shinkansen services, a spokesperson for JR-Occupation-Zones-West said."
"The train situation has developed not necessarily to Japan's Advantage" -Japan, upon agreeing peace with the Allied Railways of Amtrak, British Rail, SNCF & Others