Jim Gates wrote:

One thing to remember is that 1942 was the height of the massive tank car movements from Texas and Oklahoma to the east. This was in response to U-Boat attacks on coastal tankers and continued until the completion of the "Big Inch" pipeline. You would expect major disruptions in "normal" car patterns from this, and could probably justify almost any TM car showing up.

Good point, Jim. That situation also means that lots of pretty old tank cars were pressed back into service, so one could justify some fairly elderly cars as well.

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