Macro Video on SLR - depth of field range awful

[88Zombies]

Using a NikonD90, trying to take a video of a model train rotating. However, the focal range on the video function is awful.
I've tried pulling the camera back but as expected this reduces the quality...
Any ideas?
This video below is essentially what I'm trying to achieve, but my train is slightly longer and as you can see on this video, the foreground and back ground of the locomotive are slightly out of focus too!



Any help would be really greatly appreciated! (even if it means getting a new camera/lenses!)

 

[jaomul]

Close down your aperture as small as possible (biggest number)

Failing that-Use a camera with a video function that has a smaller sensor such as your phone or a p+s with video function.dslr sensors are big and this can help reducing dof, but its going against you here