Dolrailer is one of my favorite vehicles of the bunch since I like trucks.  The flatbed part of the truck is not detachable which makes for an awkward rolling vehicle.  Although, if you pull out the flatbed you'll see the two black joints that will allow you to bend the rear-end 45 degrees, simulating a "turn".

He is approximately 9" in length which is the largest figure of the five.  He is also the Leader of the Combatrons.  Dolrailer is packaged with all of the extra parts which make up Baldigus (Jet-like chest piece, fists, feet, and head).

Another variation of the Flatbed Truck (pictured on the right) shows Danger rolling up the ramp of Dolrailer.  This mode is created by separating the front-end of the truck and folding them back 180 degrees.  Next step is to pull out the rear-end, separating them in two, the folding them to the sides and up.  They should butt up against the front end so that you can slide the ramp into place.  The last step is to remove the cannon and slide the base over Dolrailer's head.

ROBOT MODE:   To transform Dolrailer into robot mode from the second vehicle mode, fold back both ends of the trailer back so that the wheels are behind his legs.  Now pull down both legs exposing the black parts between his Orange pelvis and camouflage legs.  The hands are exposed by pushing down the black switches on the outer sides of his arms.

Next, re-attach the cannon to his back so that the barrels are in the upward position.  Attach the chest piece, Dol Laser Rifle, and ramp which now converts into a shied (pictured above).  Dolrailer now stands about 7 1/2" from cannon to toe.

Dolrailer makes up Baldigus' mid-section which becomes a receptacle for the rest of the Combatrons.  To transform him into Baldigus' mid-section from vehicle mode, perform the same steps to create the second vehicle mode with the addition of rotating the front-end (cab) back and up. 

The above photo shows Dolrailer in Robot Mode.

Here is Dolrailer in Vehicle Mode with attachments for Baldigus.

Here is Dolrailer's second Vehicle Mode and Danger as a stand in.

Here's a close up photo of Dolrailer's head with his Red painted eyes.

The reason you need to do this is so that Baldigus' chest piece fits properly.  Now fold back the ends of the trailer so that the wheels are behind his legs.  Dolrailer should appear to be in a Sumo-squatting position :)   At this point you should see the attachment ports or either side of his arms, legs, and chest.  Just connect the rest of the Combatrons to his shoulders, knees, the cannon to his back,  and finally Baldigus' head over Dolrailer's head.  Viola!