Sure they existed. I saw them in Pasco, WA after the merger, and in 1984 they, along with similar GN and BN 4-bay cars, were very common in CSX's (was it still Chessie then?) Russell, KY yard. Like Doug, I'm surprised that one survives in CB&Q paint, even if there isn't much paint left. This one had to have been painted no later than Dec 1968, as cars were being delivered in BN Green in January of 69. So its paint is at least 45 years old!