Lines were gradually electrified, but not until 1914 were the last mule trams taken out of use, upon conversion of the Kennilworth route to electric trams.:18 The last day of service was 30 November 1947, with the closure of the Kennilworth route.:25
A heritage tram line opened in 1985, on a 1.4-kilometre (0.87 mi) line connecting City Hall with the Open Mine Museum, located on the De Beers Consolidated Mining Company premises, passing the "Big Hole" (Kimberley Mine) along the way. It was designed as an attraction for museum visitors. Service began in October 1985, using a single tram: Open-sided, four-wheel car number 1, built in 1905 for the Kimberley & Alexandersfontein Electric Railway by the John Stephenson Company. It had been converted into "tower car" (overhead wire maintenance car) No. 4 in the mid-1920s, and was reconverted into a passenger car in 1983–1985, for use on the heritage tramway. The line is entirely single-track and includes street running along Church Street and roadside running along the old Pniel Road and North Circular Road.
Service on the line was suspended from 2005 until November 2006, during renovation of the museum. Service was suspended again in 2008, when erosion of the sides of the Big Hole led city officials to close Pniel Road to all traffic, for safety reasons. There was also a need to upgrade the braking systems on the tram, along with other issues. There was a possibility that the line might never reopen, but service resumed in June 2010.