Where did you get the two tiny motors in your pics? One or both might be a great match for a project I have for early next year.
The "Motor" on the dog cart is pure illusion (a watch gear glued on a brass tube) for an April Fools joke thread years ago. But it is based on measurements of an actual motor in production - as long as you don't mind paying something like $700 for it or some stupid thing.
The bigger motor on the tie cart is a Radio Shack "Zip-Zaps" first edition motor, that was even too small for them, but you used to be able to get those very inexpensively in four-packs.
I got a bunch of 9V Motorola motors similarly sized for $1.00 each, they do work, but man, as you would imagine, just no torque at all.
My current successes are based on the Solarbotics GM15 motor and gearhead, it works great with a dropping resistor, makes my Climax kits run at 9mph flat out, if possibly sounding like an N scale beehive.
http://www.solarbotics.com/products/gm15/Those are really cool little motors. I drill the plastic end out and put in a shaft or a universal. That works.