G12

From 2008's Engine Sentai Go Ongers, here's the mechs from the series. Not the deluxe versions, the candy toy versions are more poseable, downside is their size and the crappy stickers that came along. Painting them like model kits may get you damn real cool mechs.
First up, Engine oh which comprises of Speedor (Red ranger), Bus-on (Blue Ranger) and Bearu (Yellow Ranger).

Engine Gattai!! Engine-Oh Tune Up!! Go On!!


GunBir-Oh consists of also 3 vehicles, Gunpherd (Black ranger), Birca (Green Ranger) and Carrigator (both Black and Green Ranger)

Engine Gattai!! GunBir-Oh!! Tune Up! Go On!!

 Seiku-Oh is formed by Go Wing team, Toricopter (Gold Ranger), Jetoras (Silver Ranger) and Jumbowhale (Both Gold and Silver Ranger)

Engine Gattai!! Seiku-oh!! Tune Up! Go On!

G6 Formation!! Engine Gattai!!Engine-Oh and GunBir-Oh combines to form Engine-Oh G6

G9 Formation!!! Engine Gattai!!And all of them can also merge to form a Super robot Engine-Oh G9

This is not a bad set, while the single Robot forms has much more poseability, the fully combined form still has a little articulation mainly the arms.
 
Even though this is not the final combined robot, there's still Kyoretsu-oh which is able to combine with Engine-Oh G9 to become G12
The final team of engines are the prehistoric Train Engines driven by the Red Ranger, Kishamoth,

T-liner & K-liner.

Engine Gattai!!! Kyoretsu Oh!!

 The last and final combination formed by all the Engines.
G12 Formation!! Engine Gattai!!! Engine Oh G12!!
 
 
Though mine is not fully painted, check out the fully painted one from another collector, thats real cool Mecha!!!
Real sweet paint job!!!