“My Dear Aunt Sally”
In arithmetic there is the mnemonic phrase “My Dear Aunt Sally” intended to prompt recollection in pupils of the operations: “Multiply, Divide, Add and Subtract”, the requisite “Order of Operations” for solving simple arithmetic expressions. As I’ve been designing and building my model railroad layout (for seemingly ever… but we won’t talk about that! [:-^]) it occurs to me that there is a suggested order of operations to follow there as well. Regardless of whether your overall design is meticulously planned or else ad-hoc, when it comes time for the building, it’s best to construct the benchwork-- or whatever supports you’ll be using-- first, and then begin working on the rest of the layout from back to front, starting ideally with the backdrop. And those are the two things I want to talk about today: Order of operations, and backdrops.
Something I hear all the time from folks on the various forums, and know firsthand from my own experience (ask me how I know is how difficult it is to install a backdrop after the layout has been built. Even if the intention has been all along to “someday” put up a backdrop, there just comes a point when, excepting the most trivial of cases, it becomes difficult if not practically impossible to retrofit a backdrop into the layout. So clearly, decisions regarding backdrops should be made very early on and if so inclined, provisions made at the outset for its creation (or acquisition) and deployment, since nearly every other aspect of the layout construction occurs to the front of it.
Then, focusing on the backdrop itself, the question becomes "What sort of backdr