This is a well protected mostly 5.9- to 5.10- trad line with bomber gear. A bolt protects the wide section at the end of the first crack as well as the crux roof. The rock is is a little gritty under the roof and the bolts reduce rope drag and any nervousness about the rock. Mount Lemmon is not noted for it's good cracks but this is one that allows you to place cams and believe in them. I wish it was more sustained but the rock gives what it has.
This route is actually on Choo Choo Rock but mere feet away from routes in the Corridor at the Train Station and thus included here. It starts in a left facing crack/corner that leads up to a right facing right angling corner capped by a roof.
4 bolts, single from .3 to purple camalot then doubles to #3 cam