They have been ganging tractors of all types together for a long time. Honestly I don't know much about the farming side of things but on the construction side they used to tie two D9 CAT dozers together for the additional power. I've only seen pictures of both type setups, but when they needed ripping power they would tie two of them together front to back, and when they wanted pushing power there was an oversized blade made and they would tie two of them together side to side.
Beyond that, scrapers, especially the larger ones, have been using the multiple tractor idea for years. In that case the machines weren't actually tied together permanently, and they do one of two things. One is the scraper pulls into the cut, drops the bowl, and is then pushed from the rear by a dozer to load it. If a company only does this on occasion they will usually use a regular dozer blade to do the pushing, but when there is a dedicated dozer they do make a cushion blade specifically designed for the job. The other way, and it's more prevelant with the larger scrapers, is that each machine has a hitch pin on the rear and a hook on the front. When they go into the cut they will hook up to each other. This basically gives each machine twice the power it would normally have to load. In larger operations I have seen pics of three or more machines all hitched together. More power equals faster load times, equals more dirt moved in a given amount of time.
In the end I guess you could say the main purpose of doing something like this is time and money. More power means the job gets done faster and the owner makes more money.......
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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