Steve: We’re working on an all-grain issue. It’s been in progress for over a year, because it’s turning out to be so complicated. Grain is what I like to call “inconsistently consistent.” Or, “regularly irregular.” That is, there are patterns, but they are short-term and constantly shifting. This is very unlike coal, which moves highly predictably.
“Unit grain train” is actually a misnomer. Until recently, there was no such thing, even though they were called that! To add to Mac’s and LC’s info, grain moves in the following ways:
single-car: a car on an individual waybill running by itself from origin to destination, though it’s probably moving with other grain loads, at least at first.
10-car block: offered by some railroads; used primarily by shippers such as small food plants that are “landlocked,” and cannot expand to accept more cars at a time. These are common east of Chicago.
25, 26, and 27-car blocks: very common. Usually four of these blocks will move in one so-called “unit train” to one export elevator or feeder, though they originated at four different country elevators. BNSF uses 26-car blocks for wheat and 27 for corn (corn is slightly less dense); so you get the same number of bushels this way whether it’s of corn or wheat. The idea is to bunch blocks into a single train as quickly as possible and leave it untouched as long as possible. Flour mills, ethanol plants, and corn sweetener plants commonly purchase in 26 and 27-car blocks; they are rarely large enough to take bigger blocks.
52 and 54-car blocks: also very common. Just a bigger version of the 26 and 27.
Shuttle trains: 110 cars on BNSF. These are true unit trains, and move on a single waybill from a single origin to a single destination. But unlike coal, grain doesn’t move in large enough quantities, consistently, that you will run them over and over and over again. So they are sold in one-train, five-train, ten-train, or monthly or yearly increments. T