The mix of old style and new style CFRs during the 50s was common. I believe some of these vehicles retired in the 70s still with these numbers. By the 80s, any remaining vehicles (trailers mostly) were given the normal CFRs. I recall both a WW2 Ben Hur trailer and a Compressor trailer (which I now own) still in service in Manitoba during this time period.
Now just to muddy the waters even further, the census code was also painted on most of the vehicles during the 50s. Not on the doors mind you, but usually on the front of the vehicle or trailer. I have an origional painted M100 which still shows this number, and It was also on the cowl of my KL, along with many of the other vehicles I have restored from the 50s. I have seen the ECC used the same way, although not as frequently.
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