I modeled Japanese trains from 2007 until 2012 when O gauge caught my eye. Tomix is the largest Japanese N gauge train and track line and usually first train for Japanese children. Tomytec is a sub line of Tomix. Both Tomix and Kato have large showrooms in Tokyo. Most current prototype trains are available, especially in N gauge.
Most Japanese trains are electrically powered, but Japanese modelers do not use working overhead just dummy poles probably because of the small size and temporary nature of layouts.
It is rare to see an O gauge item listed with a Japanese dealer.
For more information on Japanese train modeling try JNS (Japanese Modeling & Japan Rail Enthusiasts Forum.
Hobby Search is a larger Japanese online model train dealer, dealing mostly in N gauge.
