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Half the fun is getting this old stuff useable again. Light oil on all the bearings, motor in particular would be a good start. The motors will just need gently coaxing back to life. When the oil has had time to penetrate try rotating the armature by hand if possible. Looking at the photo of the motors rotating by running a thumb or fingertip over the exposed armature would be a kind start to life again.

That's a GREAT set by the way. Very desirable cars.