You present an interesting premise, RRMAN.
My experience at having a layout has been exactly that - change; change; change. Why? I don't know, other than to conclude that I discovered , as I progressed, I liked being creative and playing with those wonderful trains of ours.
The first layout was the cliché "spaghetti-bowl" of track and myriad, numerous switches, with trains zipping and derailing every where, with switches being thrown everywhere (ten 0-27 and ten 0-72 !) derailing everything possible that passed through them. Lots of toy models acting as "scenery" were positioned throughout, such as here....
….which was changed ultimately to this...
….and here....
…which was changed to this...
My wife suggested the layout was something I might want to share with our friends and relatives. The first time I did so, they were in the basement trainroom for approx. 20 min, and I suspect a lot of that time was out of simple courtesy for my enthusiasm, not theirs.
So, I decided to continue giving them something more to see in addition to the trains. No part of the layout would be considered unavailable to change.
I stripped the entire layout down to the plywood, like here for this later project......and removed all but two switches, allowed for a main line - on ONE of the three mainlines, only. One particular "valley" changed entirely, inch by inch, several times, as seen here..
My wish was for the trains to simply GO, uninterrupted, with places to be, places to go to, and places from which to return.
Every weekend, I attended train shows available to me in the Northeast area, and I poured over many model train magazines, finding much inspiration and many ideas via the increasingly available new modeling products, such as those from Valley Model Trains site and Scenic Express catalogues, stimulating my imagination to no end, right up to this minute. I especially enjoyed and benefitted from Jim Elster, of Scenic Express, who, when I told him I was going to have hills and "mountains," advised me, "Have fun, but don't make it look like the moon," sage advice , indeed. I guess he suspected I might get carried-away, in my enthusiasm. The many products available changed constantly in my creative adventure, resulting in layout areas like this "suburban" neighborhood evolving from porcelain houses....
to craftwork edifices...I found myself changing in my interests from a toy-like appearance for the layout to one that I was hoping would look more "realistic."
When the entire layout was all re-accomplished, guests stayed in the trainroom, asking myriad enthusiastic questions, pointing personal "discoveries" out to me, and had to be encouraged to go upstairs for a buffet, after what became often 1 1/2 hr. of model train cheering.
FrankM, Moon Township, USA. layout