Givens and druthers

When designing a model railroad, it is common practice to make a list of givens (fixed parameters, like room size) and druthers (preferences). I believe the terminology comes from famous layout designer John Armstrong; see this LDSIG page has some more information.

Givens:

1. Our "two car garage" has only one door and is pretty narrow. Perhaps precision drivers with Minis could fit two cars in, but I think we're limited to one. That one might be a minivan. The garage must also fit things like a table saw and other tools. The workable layout space is thus along a wall about 19' long (no obstructions like electrical panels, doors, or windows) and 2' wide
2. Limited time: two young kids and a job that can easily expand to fill all available time means I can realistically expect to devote maybe one or two evenings per week to the layout.
3. Limited budget: my job is interesting and pay is reasonable but not extraordinary. I'm also a cheapskate. So, I'm not going to spend thousands of dollars a year on equipment.
4. Primarily lone wolf: I am not expecting others to help contribute construction effort to the layout.
5. N scale (see previous post)

Druthers

1. Boston & Maine, transition era. I can run steam and diesel. On the B&M, this means first few years in 1950s (I'm willing do something like set the time period to "1951-1953" rather than "Oct. 14, 1952" -- I might have a focal year, but I'm not going to go insane trying to figure out exactly which branch a particular locomotive was assigned to at that time).
2. Freight: through freight, some yard switching, some locals, some interchange. I am thinking of having three "zones": a yard with a small engine terminal, a small industrial area, and an interchange (though zones may overlap, of course).
3. Passenger: model the commuter rush (trains running towards Boston in the morning, away in the evening) but no real passenger train switching (if there happens to be room for it, fine, but it's not a design priority). Perhaps a steam engine and some passenger coaches and/or some RDCs.
4. Live crossing and interchange with another railroad. I'd like this to be generic enough that I could credibly run a train of one of several railroads that interacted with the B&M (MEC, NYC, B&A, New Haven, etc., not roads like the Pennsy, Santa Fe, UP, etc.)
5. Fun for one operator: I'll probably mostly be running alone (though I will be exploring the possibility of having my father Skype in to run a computer-based throttle, and my kids might get involved). I am willing to write or use software to simulate some jobs (automatic dispatcher, perhaps a through train being run by the computer) but I don't want to have to wrangle a 15-person operating crew to be able to run my railroad.
6. Ample staging: I want to be able to store several trains. I'm almost thinking of having a British-style layout, where the focus is on one location and trains cycle through there from staging. I'd also like the staging to handle things like running three commuter runs in one direction, then the same number in the other direction, without needing a lot of equipment (ie., I'd rather have loco #610 make three outbound trips in a row rather than have to buy three locos and all the passenger equipment).
7. Get my geek on: my job involves a lot of software development, but I would enjoy doing some of this with the layout, too. For example, I'm already playing with code that allows an Arduino to control a sector plate with a servo (more info in a future post -- see this video for a similar project done by someone else). Doing this sort of thing is fun and allows for many more possibilities in layout design and operation.
8. Possibility of getting the kids involved: both my kids (age 4 and ~2) like trains and train rides, so I'd like to design a layout that is sufficiently kid-friendly that they can run trains without me breathing down their necks: that means something allowing continuous operation and having operating scheme elements (like a car-forwarding system) that can still work, perhaps with minor fixing, after the kids are done running.
9. Animation: helps keep kids interested, is geeky fun, plus something I just like. I don't want cheesy things (think those Lionel cars with the giraffe head popping out of a car) but things that operate realistically. One inspiration comes from a Model Railroader article (mid 1990's, I think) on Kermit Paul's layout, where he had things like cranes that could load logs on logging cars.
10. Winter setting: probably a third of the B&M photos, even more of the most interesting ones, show trains running through snowy landscapes. Except for a few scenes "high in the mountains", or baking soda-covered seasonal dioramas, model railroaders seem to mostly stay away from this. I think I'd like to give it a try. Besides the aesthetic considerations, it also has the possibility of making construction a bit easier: rather than ballast the track and worry about gluing the turnouts, I can cut styrene to fit between the tracks (as people do for depicting street trackage, but painted white). It's definitely an unusual look on models. It might make optosensors harder to conceal, though.