Each one will be 2' x 4'. four will be corner units, four will be straight track main line. All will be universal, so I can make a 10' x 10, or a 6' x 14'. Each on will have at least one industry, this one has a scrap yard. There is also a facing point crossover. Trolley runs on the inside, mainlines run on outside, 18" radius minimum. Pics don't do this justice, there are lots of details. I still need more cars, weathering, and will light the buildings...and more trees! Next module will be an end piece, mainline will look like a letter L.