Legend for some of the internal Trailforks ID numbers.
Difficulty
1 = Access Road/Trail #854e85
2 = White #ffffff
3 = Green #46b414
4 = Blue #148cf0
5 = Black Diamond #000000
6 = Double Black Diamond #be0014
7 = Secondary Access Road/Trail #ae83ae
8 = Proline #ff8500
9 = Red #dc1313
10 = Black #000000