Loops: 1. Put both sprites in the engine and put the loop2 script from the backdrop into sprite 3. 2. Go into the costume editor and make loops in sprite. Also put loops in sprite 3 but get rid of a fourth of it. 3. Copy costume 3 in sprite 3 and flip the loop. 4. Copy the longer line to sprite 3 and put it at the top of the loop. Copy it and put it back in the original sprite. 5. If you did it correctly you should have a working loop! Rails: Put the smaller sprite in the engine and put the grind and grind2 scripts from the backdrop into sonic.
Backpack them to put them in the engine! Also make sure the ghost affect stays on and do not hide them. Make sure the grind rails match the colors of the touching color script. The rails also have to be at a certain angle for them to work properly, but you can change the script to make them how you want them.