Thanks to JR it is possible to go to Taisho through Showa, and end up in Heisei within a single day.
?14??/1,900km?1?????????????3?????????? | ????
Unfortunately, you can't return to Reiwa.

That is cool!

Knew about Taisho station and Showa station. Did not know there is Heisei station at Kumamoto.

Taisho station is on Osaka Kanjyou Line so passed by many times when at Osaka on Kanjyou Line. Never been to Showa station but it is on Tsurumi Line which run through humangus Kawasaki's petro chemical production facilities. Majority of passengers are workers at petro chemical facilities. One of a station on Tsurumi Line the exit of the station is directly connected to employee entrance of the large petro chemical plant. If not an employee of the facility pretty much nowhere to go outside of the station.

As a self proclaimed train geek I have done train trips like that. But I understand this kind of trip is not for everybody and some will not understand a trip like this.

I didn't realize private "corporate stations" were really a thing but Toshiba also has one at Umi-Shibaura
https://soranews24.com/2019/03/19/ne...e-the-scenery/

It makes sense if the plant/campus is large enough to warrant it.

I remembered a platform south of Yoyogi being pointed out to me that is used only by the Imperial family. I just looked it up and it’s part of Harajuku Station.
Last used the year before I first visited, back in 2001, apparently.

Ah yes, the 宮廷ホーム. Always a mystery to me when it was used.

This is the best I’ve been able to come up with
asahi.com?????????????????????????????????? - ?????????