The bikes are lashed to “bike hoops” like you get in bike sheds, ropes are provided but usually very greasy.
I usually take my own strap to tie it down. I also use an old Velcro watch strap around the brake lever to limit the amount of movement, works on trains too.
If your not loaded up, pannier etc, you might want to take some form of padding (pipe insulation is light) to protect the paint.