These 40� box cars with sliding single Youngstown doors are painted in the late 1940s �Sentinel fast freight service� paint scheme with aluminum car, with blue masked sides, and blue and silver lettering. They bear the mulit-colored �Signal� heralds to the right of the doors. They were built in August 1945 by General American Transportation and run on Bettendorf trucks. Immediately after WWII, B&O introduced colorfully painted box cars designed to win-over shippers in response to the ever growing competition from trucks. This is the time B&O began it�s �Sentinel Service� guaranteeing delivery dates to shippers.