[woodcote]

I assumed that was a T-Jet (the Dino is a great Aurora T-Jet body), but those are AFX wheels... The 50-year-old pancake cars do seize up, so a strip-down, clean, lube and re-build is most likely required. This is what you are contending with in a pancake car...

   

A strange armature orientation and lots of gears! The little motor brushes can be cleaned by rubbing on a piece of paper to remove carbon and dirt. The commutator plates on the underside of the armature can be cleaned up with a pencil eraser (on very fine sandpaper if really dirty and pitted).

These are two more modern inline cars (the Tomy Turbo and Super-G+) for comparison...

       

Small tools and working in a tray (to catch the tiny pieces) is recommended - as is good eye wear and a bright light.