On pages 40-41 of Nicholas Morant's Canadian Pacific, there are photos of a
publicity shoot done inside the shops with artificial scenery outside the
window of a 2200 coach. The interior shot shows pale yellow or beige walls and
light green seats.
The photo caption says in part "Undertaking further publicity work to advertise
new passenger cars built by CPR's Angus Shops". This would indicate the photos
were probably take in the early 50's.
Hope this helps.
All the best,
Peel Steven