Knoxville Area Transit, commonly referred to as KAT, is the operator of public transportation in Knox County, Tennessee. Twenty five routes operate. Service on KAT routes operate Weekdays and Saturdays with route 11,12,20,22,31 and 41 offering Sunday service. All routes, except for routes 16,19,44,76 and 90 start at the Knoxville Station in Downtown. Knoxville Trolley Lines is a free shuttle service which provides service to the university and the downtown area. KAT formerly operated the transit service for the University of Tennessee, known as The T.