Dan Padova posted:And then there's the Williams by Bachmann version. It isn't powered by the track but by a gear arrangement from the axle.
Same is true for many (most?) of the Lionel ones shown in Ed's post.
A few of the more recent (last 10 years or so?) Aquarium cars were upgraded back to having a motor (not all - they reverted to cheapening them back to worm gears for at least a few recent ones), but I'm not sure if there are any C&H cars made recently with motors.
-Dave