High Lead: Has 2 drums in use on the yarder. No carriage, just a slab of iron with some chokers hooked to it. "Butt Rigging". They use this to log clearcuts. A mainline is attached to the butt rigging which is attached on the other side to a haulback line. There's blocks usually rigged up to stumps in the bottom of the unit. Haulback pulls rigging down to where the logs are, mainline pulls it back up to the landing and yarder.
Skyline: Used in both clearcuts and partial cuts. A line (skyline) is rigged from the yarder down (or up) to a tail hold, often up in a tree for lift. That would be the tail tree or lift tree. A carriage runs on top of the skyline (think about that pulley thing that James Bond and Jackie Chan often use to get away on) The carriage carries the mainline down the skyline. Chokers are attached to the main line. Most carriages are "motorized" around here and will pull the mainline off the yarder drum so not as much muscle is needed to pull line. Line is pulled through the carriage, out to the logs and chokers set.
Two shorts? Better check to make sure, and the yarder engineer spools in the mainline and the logs up to the carriage. When the logs hit the main corridor or road (the straight cleared area going to the landing) 3 shorts and away the logs go. The carriage has hydraulic clamps on it that act as brakes and hold it on the skyline. One short is stop. There's a lot of other skyline set ups but this one is most common, gravity, flyer, etc. names. Logging downhill requires a haulback and a flat runout area ahead of the landing so the logs don't slam into the yarder and loader.
In Eastern Warshington, yarders are referred to as "line skidders".
The guy running the yarder is the Yarder Engineer and is powerful.
The guy running the loader, also called the shovel, is the Loader Operator and is also powerful and often cranky because he deals with truck drivers.
The chaser, not powerful, is up on the landing and unhooks logs, cuts branches off logs (also called knot bumping) , cuts broken ends off logs, fetches things from the crummy, and does what the yarder engineer and shovel operator tell him. Splicing is a good skill to have. The chaser also packs guylines out to the stump, sometimes cuts down trees for guylines and swing room, and keeps the landing saw sharp and fueled up. The chaser is usually on the go.
The hooktender is in charge of the chokersetters. He goes ahead and rigs up trees for the next setting and derigs the trees that were used in the last setting. The chokersetters set chokers. The rigging crew and the chaser all participate in rigging guylines, pulling the haywire, and moving the equipment.
The chaser and rigging crew can consume mass quantities of calories and stay thin. The yarder engineer and shovel operator cannot.
Some helpful hints: If you are going to quit, wait till the end of the day when you might get ride into town. Otherwise, you might be walking back to town.
Keep your cool when you are being told "you move like an old lady." , which I really am getting to be an old lady so don't find this offensive. Don't whine. Run when everybody else is and go in the same direction. If you see your fellow crewmembers diving to the ground, you better dive too, and then keep your head down. Show up for work and don't make the crummy driver get you out of bed. And, be nice to the sale administrator.
The attachment shows a typical crummy. This one originates in Oregon.
By the way, if you are going to work in Western Oregon, you should know what poison oak looks like. And, here in Western Warshington, our serious rainy season can begin in October and usually November and on is definitely the rainy season. Goretex won't last, you need the heavy duty rubberized pants and top. These can be repaired with duck tape and shoe goo. On the western slopes of the Cascades, we get lots of snow from about 2500' up. It is heavy gloppy wet snow. Lower elevations often get snow too. The coast range gets snow higher up, and lots of horizontal rain. There, this oughtta help a little. Remember, different areas use different terminology.
Disclaimer: The author was quite dehydrated and in the midst of rehydrating while writing this piece.