[Sunred]

What I have gathered from the scans(spoilers)

- Smog Jouki(jouki means steam in Japanese) is a tyrannosaurus-type robot, and uses a finisher move called Burn Blacker(the way it shoots the blast seems like a reference to Guardian Beast Tyrannosaurus from Zyuranger)
- To combat this threat Juuru conjures a new mashin, Mashin Express, a mashin that is faster and is in the shape of an express train and is originally the White Kiramastone
- Smog Jouki is overtaken by the White Kiramastone/Mashin Express and is reborn into the steam locomotive-type mashin, Mashin Jouki
- The two new train-type mashins can combine into King Express
- King Express can fire a boomerang from its chest, can form a chainsaw on one of its arms, and its finisher move is the Burn Blaster, where a rail-shaped beam coils around the enemy and King Express finishes it off by firing the boomerang-shaped energy blast
- It seems the ruler of Yodonheim, Emperor Yodon, will make an appearance in the foreseeable future


So one thing to keep in mind here is that the scans seem to differentiate between Smog Jouki and Mashin Jouki by saying the t-rex form is Smog Jouki and the steam locomotive is Mashin Jouki. And Mashin Express combines to the tail-end of Mashin Jouki, the toy ending up to being 70cm in length. Also Mashin Express forms the head and upper torso of King Express, while Mashin Jouki forms the lower torso and limbs.