Operations are pretty simple when you boil them down. You need two things… a place to get stuff from, and a place to take stuff to. Most common, this take the form of some kind of raw-material source (mine, timber loading) and a processing plant of some kind. Or, it could be a number of industries (warehouses, oil storage/loading, factory, etc.) and an interchange yard.
The more of these “pairs” have on your railroad, the more complex your operations can become. The “temporary” railroad I built when I first moved into my house out here consisted of a 9’ x 20’ loop of track with a passing siding and two short spurs.
(http://home.comcast.net/~kcstrong/trr/pics/construction/Trackplan.jpg)
One spur was a coal mine, the other spur had a tannery, which took in tanbark and raw hides, and shipped out finished leather. The passing siding had a freight depot. The one track on the passing siding was the “interchange” track where cars came to and from the “larger world.” Hopper cars went to the mines and back, flat cars and stock cars (loaded with tanbark) went to the tannery and back, and box cars went to any of the sidings. (Tannery–loaded with raw hides; Station–loaded with freight; mine–loaded with mine props or supplies; interchange track–returning to the outside world.)
A railroad that simple, even with only 6 or 7 cars total, still took around 30 minutes to switch everything where it needed to go.
My current railroad is somewhat expanded from that, but the basic premise still holds fast; a collection of sources and destinations for freight to be carried.
Pretty much all of my industries are located either on short passing sidings (so they can be switched out by trains traveling either direction) or on short spurs–some requiring using the passing siding as a runaround to switch the spurs.
I “operate” this with anywhere from 14 - 20 cars, and it takes me anywhere from 1.5 - 2 hours to get everything where it’s supposed to be.
(Gratuitous commercial announcement) I wrote a 4-part series on prototype operations in the garden, which is included in my new book “Garden Railway Basics,” which is available from Kalmbach (or your favorite online retailer)
You might also check out John Armstrong’s “Track Planning for Realistic Operations” (also from Kalmbach and available online). While written more for the small scales, John does a great job of laying out a lot of information about how to model industries on your model railroad, and easy ways to scale some of those aspects down to small spaces.
Also, you may want to look specifically at books on narrow gauge railroads. Regardless of whether you run standard or narrow gauge, the operations of narrow gauge railroads tend to be microcosms for the larger world, and can more easily be boiled down to garden-sized railroads. (For example, the track plans of two of my three yards on my current railroad( the ones on the lower left and right) are pretty much identical to the track plans the prototype had at these locations, with a bit of license for space available.)
One thing to consider, though is how many operators you may have on the railroad at one point. My railroad is set up for one operator, so none of my passing sidings are actually “passing” sidings where I can pass two trains by each other. If you foresee yourself hosting operating sessions with multiple operators, make sure your yards can handle two trains passing each other.
Later,
K