"You, the bright-eyed and bushy-tailed denizen of our modernworld, are leaning back in your Swedish office chair, admiring that flowing track plan you just created with the Nifty-CAD trackplan soft-ware you've installed on your turbo-charged wide-screen high-definition 25GHz Micro-Mac (with optional trim package). As you sip on your latte, you dream about those SD90's sweeping through the last curve, entering the combination helix/staging yard through a double-track tunnel portal. Now hidden from view, they speed through the double-crossover and...
Well, they picked the points, crashed into the uprights supporting the next level of the helix, and you have to quickly run to the bathroom to sponge all that hot so-called coffee from your crotch. When you return to the trainroom, there is an acrid smell of burning something hanging in the air. After a quick check of the area of your physique recently assaulted by that most lamentable waste of coffee beans, you determine that you've roached one of the switch motors. After several hours of sweat and incantation, you collapse in a dripping babbling heap of defeat, muttering something about "...make the Bad Man stop..." as they haul you away for several weeks of intensive group evaluation and pot-holder therapy."
The above quote is from an Editorial in "O Scale Trains". The point made after this opening is that CAD plans and even hand drawn ones are never perfect and you will always have to modify as you build. Especially when you realize that there is always, always, one switch that is in a very inconvenient location and that is the one that will always burn out.
The last though in the Editorial is, "...if you really must have it, the cream goes in the coffee, not on it."
Hope this gives you a giggle.
B-)