Symbolizing 3d polyline by z-value using ArcMap

I have a polyline with z-values. I need to symbolize the polyline by z-value. There doesn’t appear to be any way to do this.

How can I do this using ArcMap 10.2?

A color ramp symbology is the sort of thing I’m looking for. The individual line segments are too long of effectively symbolize by some summary statistic like Zmin/max/avg/etc. I need the symbology to be continuous or nearly so.