Hello @Reef, can you find it in the "Wagons" section by any chance ?
If not, it could be a cooking issue with this content. I have seen quite a bit of loading errors with AP rolling stock. Basically when the .bin files are decompiled to XML they contain some syntax errors. Train Simulator is loading the data anyway but RW Enhancer 2 cooking system is is much more careful than TS when reading blueprint data. If there is any syntax error in the decompiled XML file, RWE 2 will not load it's data.