Thank you, guys
I am checking all plans with the developer functions in the program to be sure that mentioned details (like size, minimum radii, maximum grade, etc.) are correct and that all track joins fits in the default tolerances before publishing. Also, I am checking for parallel distances, especially when there are two parallel tracks with different heights, bridge heights, tunnels and loading gauges and several other parameters in each plan. So in general, all published plans are doable. Some of them are published after actual building (see: Already build layouts, designed in SCARM
), other are published in the phase of construction (see: SCARM layouts under construction
) and I know that some of the published plans are now prepared for building, with some minor modifications. Actually, I have received twice as more plans than already published, but most of them are just not able to pass the verification procedure - there are disconnected tracks, too steep grades, too small radii of the flex tracks or something else that may lead to problems if somebody start building of such layout.
The Large Complex HO Layout
mentioned above is representing one project from an old book with track plans of Tillig - a German model trains producer. It is slightly modified, but keeps the main idea for complex and realistic opertions. The hidden parts in the lowest level are used to keep up to 4 trains and simulate heavy traffic through the main station.
I.e. a passenger train that departures from the main station goes in the tunnel and then stops, while other, already parked in the tunnel freight train starts and simulates continuing of a long travel when leaves the tunnel. The passenger train waits for a free main line and then can continue on its route. In this way, there are various possibilities for the operations on the main station and the modeler is playing with more different trains and scenarios instead of watching one or two same trains passing over and over on the double main line.
More plans with hidden areas like that can be seen here: Track plans with shadow stations / fiddle yards
. However, controlling of such layouts requires some skills and may not be suitable for beginners, making their first layout.