Yes, they did change around 1949 and 1950, with different models at slightly different times. I think some of the first VR systems went onto 9-Series tractors, although I didn't try looking that up just now.
Parts catalog for the H shows the change at serial 340954, which was during 1950. I'm not finding the right reference right now, but I think the C changed before the end of 1949, so a '50 tractor would have been a VR system.
A '46 H clearly would have been a cut-out system when new.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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