Here we go, A-Train 9 V5.0 has been released to steam users to the western world.
https://store.steampowered.com/app/3106160/AT…timate_Edition/
There is a little note tho:
Notice to customers outside of Japan:
Please be aware that there are some content differences between the version of A Train 9 v5 released in your region, and the version released in Japan.
According to the Steam Community post, the Steam release includes 97 trains.
The japanese release came with 343 (including vehicle kit 3)