I happened to be surfing the net when I found this:
http://www.oobject.com/tiniest-gadgets/worlds-smallest-model-railroad/279/
I guess model railroads are getting tinyer and tinyer…
Derrick Moore
Oooo, I want one for work. But then again, I could probalby get away with a Z Scale loop-dee-loop. Maybe around the backside of my monitors and around my books. 
Attaching new couplers is going to be a real [censored]
Neat! Someone posted a pic a while back of a whole freight train that fit on a toothpick.
I’d like to see a tutorial on weathering that yellow tank car. Do those trucks have the right color “rust” on them?[(-D]
If the sticky tape roll is standard size, there was a photo of a smaller HO layout published in MR half a century or so ago. It consisted of a circle of rail on ties, gauged to a silver dollar. The train (“Locomotive…without cars, carrying markers,” Josserand, Rights of Trains.) was a Varney ‘Little Joe’ dockside 0-4-0T.
Who said HO was too big?
Chuck (modeling Central Japan in September, 1964)
Wow that is neat ! IU wonder when MTH will come out with a bigboy or K4 to work on this scale. (Ducks and covers after that horrible attempt at humour )
Rob
“Wow Dan, your new layout is really sniff…ACHOO gre…hey wait, where’d the layout go?”
Hmm cool but does it really work? I mean how do you make a loco that small?
In a really little factory?[(-D]
There’s a pin wire under the track that pulls it.
Good question…
You SURE???
Yeah, but the question is, does it have DCC and sound? I mean, c’mon! If it doesn’t have DCC, sound, and hidden staging plus time-table and train order operations with car cards and waybills, well… It just isn’t a model railroad, is it?
[:D]
Its cool and all, but I dont think I would classify it as model railroad… A novelty perhaps.Albeit a neat one.
I believe one detail that the article failed to mention is that the layout can only be operated in a hermetically sealed glass walled chamber, with double-HEPA filtration, because the slightest speck of dust on the track causes a massive derailment.
Why would it not be a model railroad?
Try this one on for size, a model of a 4’x8’ model train layout, scaled for display on an N gauge layout.
Its 1/2 inch wide!!!
http://whiteriverandnorthern.net/clinic_08.htm
My eyes are hurting just thinking about this one…
He’s correct. I’ve seen them at train shows before, and they are kind of neat, but expensive. The person who makes them sales them on ebay:http://www.tiny-trains.com/
At the last GATS show I attended in Las Vegas, they had a train of the OP’s size that ran on air. I thought it was pretty cool looking.