Quoting "Alan C. Welch" <email@example.com>:
Probably the first CPR Fowler car received a Youngstown door in 1929. It
If it already had a Murphy roof how can you be certain it was a Fowler
car??? IIRC almost all Fowler cars constructed for the CNR and CPR were
originally constructed with wood roofs and all Dominion cars, which is what
they really were, that made use of the Fowler patent were constructed by
the end of 1914. Not long thereafter most of the cars were built new with
Murphy or other metal roofs. Not being at home at the moment I do not have
my files available to check more closely on dates.
It is highly possible that the first CPR Dominion car received a
Youngstown door in 1929. However, the first CPR blueprint found to date
showing such a change seems to be the one for the upgrade program begun
in early 1935 that called for Youngstown doors.