i had already researched them when adding it to the save. is this the problem? I don't want to de-research something and negate our achievement run here, if possible. might have to avoid it until the next playthrough with mods. fwiw, i did see it on my last attempt with .17 Seablock and I thought it had its own "Chonky Trains" research item.. because I remember telling Auto Research to figure it out. but we never got far enough to build or deploy them. still hoping to see it run someday.