Maybe GRJ or someone here has worked with smaller, but this is the smallest electric motor I have ever working with. I took apart one of the small, inexpensive reomote control cars to pirate parts for a home-made wire-guided car, and this was its motor. 1.5 volts, probalby puts out 1 nano-horsepower.
Lee, there's these cheap remote control cars from China: < $10. They're 3.15" long (scale 12.6'). They may provide a source for powered chassis' as they have articulated steering. They're remote control but that could be bypassed (or leave the throttle function for little ones coming to play ). The cars have a rechargeable battery, and, I believe, they recharge via attachment to the remote. The remote uses two AA batteries. There's others out there as well. Link
Thats pretty small. I have some 6mm gear motors that are about the same size as that pencil. That one appears even smaller. Hopefully those gears never bind or the car hits a wall or the stall current will smoke that motor instantly.
This the 6mm gearmotor. The black section houses a 760:1 gear reduction. The screws are 2-56 for comparison. Pololu.com is one source for these.
A variety of low-current brushed DC motors with plastic gearboxes that offer power and speed comparable to a continuous-rotation RC servo at a fraction of the price.
I have several MTH PS2 diesels that I have purchased over the years starting around 2006. I do not have a layout but I am close to starting one which will be constructed using Atlas track with minimum curves of O-81. Most of my engines have scale wheels and fixed pilots. All the engines were...
Except for the diaphragms, Just completed my first Walthers passenger car kit. Not the hardest kit I've ever built, though there were some difficult obstacles to overcome. It's not the greatest, but was fun to build. I left it pretty generic so I could run it with multiple different road names.
A couple of years ago I started to transition from HO to O. I had limited space (8' X 15') so I decided a small industrial branch would be best. Using FasTrack I built a layout with 5 industries and a yard/interchange. I got a Lionel Alco S-2 and 10 freight cars, a Legacy controller, and started...
I’ve been getting quite a few special announcements from MTH lately for uncatalogued items available at only one exclusive dealer. Seems like I’ve been getting about one every week. I usually dismiss them, but I thought I would pass the latest one on (a Southern Switch Tower at the Train Loft)...
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). The cars have a rechargeable battery, and, I believe, they recharge via attachment to the remote. The remote uses two AA batteries. There's others out there as well. 
