Came across this little N-gauge micro-layout by Mike Holly on the Model Railroad Hobbyist forum. It’s only 43.5 cm x 17.5 cm in size (I guess about 18″ x 7″.) Operation is made possible by two short traversers at either end of the layout.
It gives a fair amount of operation in a tiny space. The whole layout is in a ‘picture window’ and this tidy presentation helps it look bigger. And the photos below show that the close attention to detail make a realistic scene.
Another inspirational little layout to show that you don’t need much room to run trains.