B&O Color Notes

Here is a thumbnail B&O passenger car timeline:

In Civil War times into the 1880’s, mention is made of B&O passenger cars painted brown. Photos suggest head end cars might be yellow.
At some point, the olive coach green was adopted, it is close enough to Pullman Green for most modelers.
During 1900-1906 or so, passenger cars on the New York – Washington Royal Blue route were painted blue. Discontinued due to durability problems.
B&O introduced the famous blue and gray with the new Capitol Limited train sets in 1937. This scheme was restricted to name train matched sets and their substitute cars until 1953. All other cars remained olive coach green until 1947, including head end cars.
In early 1947, B&O replaced olive coach green with Bando blue with an imitation gold stripe, for most cars including head end cars. Wagontop express cars did not have the gold stripe, name train car sets remained blue and gray.
In early 1953 the blue and gray scheme was extended to most cars. Exceptions were express cars, which remained blue. There was a 1953 B&O memo that non-air conditioned cars would remain blue too, yet this was countermanded by another memo, days later.
With the C&O takeover, around 1964, B&O adopted a simplified C&O scheme for passenger cars. Many express cars remained blue.