I am led to believe that the film clip below of the Hornsby Chain Tractor is the earliest of a crawler tractor, it was made in 1908 in England by Hornsbys,bit grainy now and is silent with subtitles,the second part of the clip is from 1953 of the infamous Vickers VR180,its in colour and has sound,both clips have been posted before by me on other sites a few times,the second clip is of Cats racing in the 1920s
Enjoy
AJ
http://media.putfile.com/Machinery-95
http://media.putfile.com/KeystoneCats
Enjoy
AJ
http://media.putfile.com/Machinery-95
http://media.putfile.com/KeystoneCats