Sent a message out to the NETCA board of directors to get the story on this and will report what I learn.
If anyone wants to check out the tank car, see the NETCA Commemorative car section on the web site. Or you can review all the past commemorative cars NETCA produced going back to 1968, Click the image thumbnails under each section for larger photos.
Meanwhile, here is a photo of the next car in the series.