It's a nice and ironic writing. I can not imagine when you say that Placer River Gorge Adventure is the narrowest. And in the train we must be extra vigilant, so we have to keep our hands. Which I know the most narrow it is a hole ants or sewing needle sewing hole. And I'm still confused and can not pass on "what is the least bit of Placer River Gorge Adventure ?. if I ask you back: what is the most narrow in the world? Maybe your answer is ant hole one of them.
Although it's a narrow Placer River Gorge Adventure but it's so beautiful that you come across on your way. And it becomes something you can spare. Really you are amazing. Thanks regards @ijoel