Buck (Dennis) there is one for a 20+ person Train. I was part of the testing of it. Unfortanately there was a bug that day, but at least I made Stalker LOL
edit: Forgot to mention that you need to have kept the line going through 5 different areas. I think you may all need to have the Stalker badge first but I didn't actually hear what the bug was that prevented me from acquiring the badge. Thanks to JoeBlow who was our Engineer that day and Essie Kitten as well who was instrumental in determining that it was bugged that day. I think it is likely fixed now.