Went for a ride once and got a souvenir whistle.
I listened to an old interview with John Draper (AKA ‘Capn’Crunch’) the former ‘phone phreak’. He discovered that the Oscar Meyer whistle sounded the same tone that the AT&T system did to indicate an available trunk line. He went on to create the ‘little blue box’ tone generator - which eventually helped lead to Apple. Of course, he also ‘went on’ to do time in prison for playing with the phone system. Very strange story about the obsession people had with phone system hacking.
https://telephone-museum.org/telephone-collections/capn-crunch-bosun-whistle/
https://en.wikipedia.org/wiki/John_Draper
One of the six Wienermobiles showed up at a neighborhood event a few miles from my house last year. I went home and got my wife, but it was gone when we returned.