Plarail TOMY Thomas NEW RELEASES

Here is the Plarail Scenic Color Rail Kit ~Snow and Railway~. It looks really nice! 






Recently, Plarail has released very few trains from the series of commuter trains, even fewer new models/moulds. Now, I know this is the so-called "SE" series, but could these trains (Rilakkuma & Sumikko Gurashi) have been more poorly and cheaply made? Is this worthy of being named Plarail?





Additionally, it seems to me that the motor car "hangs" a little backwards. And what about these stickers? Do customers have to apply them themselves?
Also, there is a strange remark in the official description of the products: The vehicle is the ES series. Some specifications are different from existing vehicle products. Depending on the combination, you may not be able to play as intended. (machine translation) Any ideas what that could mean?