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Anymore info on that tandem tractor?
The photo is from Australia. It is a tandem tractor made by joining two early Lanz Bulldogs together. I've seen lots of these, in photos, and a couple in the flesh but not one built from Lanz Bulldogs before. Note the tyres, they have 'overcovers'. It’s an old tyre of a bigger size with the beads cut out and then you squeeze the smaller tyre inside before you put it on the rim. It helped with preventing punctures in freshly cleared land, particularly in "mallee" country where clearing trees of eucalypt species left pieces of timber that could spear tyres.
The Bulldogs are unusual, tandems usually look more like this (2 x Ford 5000s)
During the 1950s farmers in the United Kingdom in need of high-power tractors had few options. Farmer George Pryor developed an ingenious solution to the problem by creating his own tractor. He did this by purchasing two Fordson tractors, removing the front wheels and axles and linking the two by means of a turntable which provided the steering action powered by hydraulic rams. This left him with a double-engined four-wheel—drive tractor capable of producing more power and outperforming any of the conventional tractors on the UK market at the time. DOE Engineering then started producing these commercially, about 300 in total. The photo above of the tandem Ford 5000s is a DOE 130 (130hp). Below is one of their first model, base on the Fordson Super Major.
As well as the factory produced tandems, some farmers built there own. Here is an Australian tandem built from Chamberlain Super 70 Diesels.
Another farm built Australian tandem, built from two Case L tractors.
A video of the above tandem.
The earlier video referenced in the first video.