This is the 2019 edition of train training materials. I've looked through the entire set, and there are no markings. Please understand if there are any, in the unlikely event I missed something. I gave up on it, but I'm offering it for sale in the hope that it will be helpful to those who are considering obtaining a certification. It's a bit old, but hopefully it can still be useful. If you have a desired price, please let me know. I will consider it.