If the Manufacturer doesn't put security systems in place, situations like this are more likely

https://news.sky.com/story/fraud-officers-arrest-one-in-dawn...

> "The company supplies engine parts to several major airlines in the UK and abroad.

> In August. the Civil Aviation Authority announced it was investigating the same company for the "supply of a large number of suspect unapproved parts"."

This wasn't a security system it was a straight up fiddle. The fact it was undocumented is the real tell.

It was a Security System, they were even told the trains are blocked because of a security system...

  > "Newag explains that the trains were blocked by a "security system" - but there is no mention of it in the 20,000 pages of the manual."

In my experience, It's more common for Security Systems to be un-documented than it is for them to be documented...