Numbered routes followed by an "X", e.g. 31X
Routes labeled as 'Express' provide service from high- volume transfer points or high-density ridership locations such as park-n-Rides, to other points of high ridership such as the downtown Denver stations. These routes, much like 'Limited' ones, only make selected stops on the outer parts of their route. They collect passengers and then continue without stopping to their final destination.

Buses follow the Sunday/Holiday schedule on the following holidays: New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.