Dang it, must have left it in another pair of pants 😳
Although there was once a site for amateurs that had tips for places both easily accessible and still remote enough that no random encounter was to be expected. Some of them with a view of the railroad. In the same note, I have read a blog post by some femsub that wrote about having been ordered to flash some specific train anywhere on its route (given that the master was someone from the internet), minimizing risk for her while still being almost at his hand... So many options... 😊