The most difficult part of building a model railway is the initial one. There are so many expectations in mind, which, unfortunately, are often in stark contradiction. We want long parade lines to watch the trains pass by. A track module as long as possible to create realistic train compositions. Double-track lines along with branch lines. The ability to run as many trains as possible simultaneously. Complex station layouts that allow for fun with the shunting, possibly with a turntable and locomotive shed, and perhaps even a terminus with many tracks. Trackwork laid with large-radius curves to ensure realism. The right balance between landscape and track is needed to avoid what I call "track-overflow," which occurs when all the available space is taken up by track. This last requirement is the result of a subjective feeling whose threshold varies from person to person. If it is exceeded, the model ceases to be enjoyable, especially for its builder.
The result of all this is an equation impossible to solve unless you have at least a few dozen square meters of space available. Having acknowledged this indisputable fact, I began the project by defining the desired functions, some rules, and guidelines so as to be aware of the constraints to be respected (primarily dictated by the space available). Last but not least, the result had to pass the final test: how close would the final result be to the ideal model I'd always dreamed of?
In my case, I completely ignored the issue of choosing the scale, as it had already been decided: I've always used the H0 scale (1:87). For those with space constraints, choosing the scale is an additional parameter to consider in this initial phase and can make feasible creations that would otherwise be impossible with the available space.
In light of the above, how should I proceed? What steps should I follow in sequence to achieve the desired result?
This section helps to retrace the mental process that I followed, of course this is only my path, even if I think it could be of interest to other enthusiasts.
First, you need to be clear about the features, defined as operating modes, your layout will need. In my case, the expectations I set were the following:
Fully digital computer control.
Division into multiple power supply zones to ensure sufficient power for at least 20 trains simultaneously.
A dedicated track for locomotive programming.
A double-track electrified mainline powered by two hidden stations to ensure a continuous flow of trains through the main station.
A mainline station with a priority track for each direction and a depot area for freight trains or rooms with uncouplers.
Ability to shunt with a small freight yard.
Automatic level crossing on the mainline.
A small locomotive depot.
Areas for maintenance and refueling of steam and diesel locomotives.
Ability to access all station platforms from both directions (north and south) and to route them correctly when exiting each track.
Non-electrified secondary line allowing shuttle trains in both directions.
Secondary line connected to the main line at both ends.
Hidden station to power the secondary line at both ends.
Interconnection between the hidden station for the main line and the hidden station for the secondary line via a triangle.
Electrified secondary station interconnected with both the main line (both directions) and the secondary line.
Sufficient number of tracks in the hidden stations to power at least 20 trains in parallel.
Two important changes were made during construction:
Implementation of the Viessmann Car Motion on the model roads.
Creation of an isolated section for the large regional fire station.