The Edmonton Radial Railway (ERR) (also known as the Street Railway Department) was a streetcar service that operated in Edmonton, Alberta, from 1908 to 1951. It was Edmonton's first public transit service, and later evolved into Edmonton Transit Service. Beginning as a small agency with 21 kilometres (13 mi) of track and four streetcars, the ERR would eventually operate more than 70 streetcars on over 90 kilometres (56 mi) of track, reaching most areas of the city. At its peak in 1929, the ERR served more than 14.1 million passengers.