Garden Railway Design.

[Mountain Goat]

Though it depends on the scale and gauge as well as the practical space one has available, a sensible question to ask is if one needs a continuous run or a type of end to end design where for convenience, both ends end up in the same location.
The continuous run does have the advantage that one can set the trains to go and sit back and enjoy. The end to end offers a more realistic type of operation. Which one to go for depends on the individuals preferences, but if one is clever, the design can be made to satisfy both criteria by designing an end to end which also has a link line so it can double up as a continuous run if needed. The main consideration regarding this method is a careful calculation of gradients where one may want to avoid a level track plan as it looks to modelly, and so any link line will need to be carefully worked out.

Planning a railway, be it indoors or outdoors is not always easy but very satisfying when the trains run!

[Mountain Goat]

Here is a question. Is it feaseable to build a model railway outdoors that can be set up and pulled down in minutes. I mean.... Something like the way the railways were built during the first world war where they were assembled like a trainset.
In that form a railway can be set up quickly and run and pulled down in almost any location subject to the terrain being suitable.