Hi,
I finally got a chance to look in the Toronto Directories. You know that he was in Toronto in 1943. The only William Constable in the Directories for 1942, 1943 and 1944 is William H. Constable who lived at 50 Stibbard Avenue. There is no William E. Do you know if he had another middle name??
In 1945, there are 2 -
William H at 50 Stibbard
William A D (constable in the CNR investigation dept) res 218 Coxwell
In 1950, the same 2 -
William H at 50 Stibbard
William D (CNR) 637 Euclid
In 1954 and 1956
William H at 50 Stibbard
William D at 106 Douglas
1957 onwards, the William H is no longer in the Directories. So, if this is your William, he could have died in Toronto or moved out West. I know this doesn't answer your question, but I hope it is helpful information. The William A D can't be yours because he is still alive in 1960.
1957 - only William D
1958 - William A D (CNR) 106 Douglas; William (carp) 236 Boulton; William (carp) 95 Pickering
1960- only William D (CNR) 106 Douglas.