Rick,
Kegresse went back to France in 1917 and teamed up with Citroen to use his track design on their cars. The cars were launched in an expedition across the Sahara around 1921.
Regarding the Austin lorry drive shafts, all I can dig up is this, from a history of British Leyland,
"1913......it was reckless of Austin then still a young and not very rich concern, to produce a vehicle so unconventional as the twin-shaft two tonner. Amongst its novelties was the chassis frame: in an age when many respectable firms were still using lengths of rolled steel joist, Austin employed an elaborate pierced and pressed assembly, nicely proportioned. Drive was transmitted into each rear wheel by way of seperate prop shafts, which passed through the chassis sides. About 2,000 were made, many of which went to Russia and some to South Africa. The design petered out in 1919"
Hope this is of help.
Richard