At the Camden Park in Huntington, WV, USA there is one of only 2 gravity fed Pretzel Darkrides left. Installed and running since the 1940's. Watching the video you will see that it is even stopped and started by a person and not a break. While not a great park i was lucky to grow up next to it so I could ride a significant piece of amusement park history.
[video=youtube_share;sxo5QQrswyk]https://youtu.be/sxo5QQrswyk[/video]
[video=youtube_share;sxo5QQrswyk]https://youtu.be/sxo5QQrswyk[/video]