Yup. I hate that detour. Be wary of the train tracks.
I save up a bit of energy before I hit it and then power through the detour as fast as I can.

Also, when it gets warmer do not get startled by the homeless across from the RTD operations center.
You can come around a bend in the trail and find 15 people standing around the trail or meandering aimlessly (more likely in the afternoon).
Don't let that scare you off. Just be aware of it. For the most part they are harmless.
I also tend to slow down before reaching that area to gather my energy and then power through it.
I tend to be a bit paranoid. It has served me well so far.