"logfile.txt" in the main "OMSI 2" directory (by default "C:\Program Files (x86)\Steam\steamapps\common\OMSI 2\" on 64-bit Windows systems or "C:\Program Files\Steam\steamapps\common\OMSI 2\" on 32-bit Windows).
The OMSI logfile isn't always reliable. That is a valid path for the vehicle. One thing it does is once it is upset, all kinds of false positives get thrown into the editor. It's far more plausible that you've specified the Scunthorpe ticket pack, but forgotten to copy it over when you restored from a backup or something.