"If you see something that doesn't look right, speak to staff or text British Transport Police on 61016. We'll sort it. See it, say it, sorted."

It haunts my dreams.

"See something say something" signs are common in the US in places like subways and airports.

Sure, but the "See it, say it, sorted" announcement is played over and over ad nauseam on the train; it's not just a sign. It's the national rail equivalent of "mind the gap" on the tube, which is also said over and over again. In the case of the tube it makes a little more sense since the ridership is changing significantly at every stop. But on a 4+ hour ride up to Edinburgh, it is pretty redundant to make the announcement every minute or so.

"Mind the gap" announcements used to exist only where there was a huge gap on curved platforms. These locations still use the authoritative, male voice.

Playing the woman's voice version at every station started about 15 years ago.

It's a thing our governments do to ensure that we are all slightly traumatized by the possibility of terrorism at all times. They make us afraid to make us easier to control.

No this is not the same. The U.K. has taken it to ludicrous levels.