Bill Wulfert found some nice pictures of the 4001 in the files and made copies of them for Frank. Since Frank wasn't there, he gave them to me. And since I'm in a generous mood, I'll share them with you. No extra charge!
These two I think we've seen before.
But these we haven't. The one on the left is evidently a test run. The car cards have information about the new car and its revolutionary design, such as the forced air ventilation and cork floor. A card on the left says: "The car will be submitted to tests in actual service to determine the merits of the new entrance" (?)