C-58 Ginga Steam Engine 6 Car Set

Also interesting, after looking this up after you mentioned the Zodiac, The four coaches are restored diesel powered which would explain about the 2 detailed front and rear cars and could run by themselves. https://en.wikipedia.org/wiki/SL_Ginga

Yes, they can run. According to the Wikipedia article you posted, it said "The diesel cars provide additional power to cope with the line's gradients." I guess the slope is extremely steep as 2 additional diesel cars are required to push the train up the hill.

Nice cars indeed. I may consider order one as well.