Thanks for the reference on the Morning Sun books. I was already aware of them.
I was looking for something a bit more comprehensive. I quickly thumbed through Vol 1 at a book store and it didn't appear to me to cover many of the paint schemes available in O scale, except for the more common/popular ones like Hooker Chemicals. Granted I didn't look at it in detail.
With regard to Vol. 2, I was under the impression that it didn't cover 1950s eras cars but left off where Vol. 1 ended and started with 1960s era cars and newer. Again not certain but the book description below suggests that is the case:
Tank Car Color Guide Vol. 2: Stub Sill Cars.
The conclusion of a two-part series examining the North American tank car fleet in color.
Contents: Single Compartment Cars without Platforms, pp. 4-19; Non-Insulated Single Compartment Cars, pp. 20-34; Insulated Single Compartment Cars, pp. 34-88; Multi-Compartment Cars, pp. 88-97 Beer Can Cars, pp. 97-105; Whale-belly Cars, pp. 106-113; 6 and 8 Axle Cars, pp. 114-120; AAR Class TVI, pp. 121-126; AAR 207 Covered Hopper Style Cars, pp. 126-127; Miscellaneous Cars, pg. 128.
I know of the ACF books too but those books focus on a single manufacturer. I was hoping for something that covered most, if not all, of the manufacturers along with build data on many of the cars. I know tank cars are sort of the backwater topic of freight cars but still think they deserve a good book on history, types (21, 27, 103, 105), and details on the many private companies that leased them from the big manufacturers.
Thanks
Bob