Within the city, roads that run north to south are generally called "streets" and roads that run east to west are generally called "avenues". Streets are numbered in blocks west of the Red River. Avenues are numbered in blocks north or south of DeMers Avenue, the city's historic dividing route next to the railyards. The city maintains a bus system, Cities Area Transit (CAT). It has operated since 1926, when it was introduced to replace an earlier trolley system. There are 12 bus routes, including night service and service in East Grand Forks.