according to the youtube video description, it appears it is using a plarail advance chassis
I used the google translate and I got the following translation:
Remodeled Plarail Advance is Hanamaki Electric Railway's Deha 3. Only with Plarail Advance, you can pass each other's last track, but Hanamaki Electric Railway seems to be a single track.
The only battery operated train in HO i am aware of is built by Atlas. HO gauge should be wider than Plarail advance.
Here is a video showing an Atlas battery operated HO scale Amtrak.
[video=youtube]https://www.youtube.com/watch?v=rLgWKWSxY4U[/video]