Aberdabr-You might take a look through the "Modular Forum" that is found about 3-4 froums down from this forum in the same section. You will hear the terms "modular" and "sectional." They are similar in that a large layout is built from smaller sections that are easily transported to set up at train shows, in malls, etc. The difference is that the ends of modules are made so that they can be arrainged in any configuration and everything will hook up and the tracks align. A sectional layout always goes together the same way. If you don't have a large dedicated space for a layout, or you want to build something for Christmas this year and then add to it next year, but still be able to disassemble it to store away in between Christmas seasons, the sectional or modular designs might be perfect for you. Also if you have a certain space available for a permanent layout, but have additional space that can be used temporarily when you are operating the trains, but needs to be kept clear when the trains are not running, sectional or modular designs can be used for that temporary expansion and then taken down and stored under the layout when not in use.