Could they be reviewing the latest Kato release of the train with updated tooling like the last Hokutosei set. My RM#198 is still enroute from Japan.
I thought that but it doesn't seem to be. First, the cars in the pics are much more detailed than the Kato set as pictured on Hobby Search. Second, they show a consist on the bottom of the second page that definitely includes some Tomix cars. They also show a couple of individual Tomix cars and the couplers have definitely been modified.
I thought it was probably an article about modifying the commercially available sets to look more like the real thing, but the stuff my wife could translate just seemed to be almost boilerplate text about the train and the models. I didn't hear her translate anything about any modifications done.
Let me know if you can figure it out when you get your RM Models. I just really want to know what I need to buy to make a Twilight Express that looks like this, basically. Or if they did everything by hand.