carrier wheels and tracks

[eddy8men]

i need to use the tracked bogies as a temporary sled for my churchill hull (18 tons) as there are no tracks and the wheels are shot to hell, so i dug them out last week and set to work. i wasn't looking forward to trying to free the links up as they looked really solid but seeing as how i was using my digger to move them around i had the bright idea to stand them upright and use the digger bucket to free em up and it worked a treat, an hour and a half later all the bogies were freed up and i never got off my arse to do it (bit easier than a sledge).
while i was messing around with them i noticed they had been painted olive drab so they were definately originally military, whether the whole sled assembly was or just the bogies i don't know as the rest of the sled is still at the yard where i bought them from so i can't check it but it raises the question again of what were they, i wouldn't want to cut it up for the wheels and tracks and find i'd destroyed something rare. any ideas ?
cheers