This is well documented in each railway publication. Also the risk is .... not existent. To damage railway infrastructure there are way more efficient and simp

This is well documented in each railway publication. Also the risk is .... not existent. To damage railway infrastructure there are way more efficient and simple ways (getting a rail to derail, destroy some signaling cables, ...) The "attack" here would require quite some investment in equipment (power etc.) and only bring a single train to a realtively quick stop, well in safe margins, where the driver after a quick check with the dispatcher can override and continue the ride, while investigators would collect the equipment. It's impractical for a stunt (way simpler and more effective: just walk close to the tracks and they will do emergency stops for all trains close by) and ineffective for an attack.