From the Wikipedia page [1] Leyton Council Tramway services started on 1 June 1905 when the council took over ownership of the Lea Bridge, Leyton and Walthamstow Tramways Company lines which were within the boundary of the council. On 1 June 1906 they also took over the North Metropolitan Tramways services within the boundary of the council. The services were taken over by London Passenger Transport Board on 1 July 1933.