There are several
abandoned rails near where I live. On one of them, there is a device which is obviously intended to derail anything passing it (and labeled as such).
The labeling indicates that it is commercially manufactured for that purpose, implying that there are many more in use somewhere. The size of the device indicates that the steel alone in it isn't cheap.
On another abandoned line, there is a derailed of a different style, but this one is on an active rail (a cement loading station is between it and the abandoned rail).
WHY would anyone intentionally spend that much money to derail trains?