Once the largest tramway network in the British Isles, London's tramways had belonged to a range of operators until the London Passenger Transport Board was created in July 1933, and this resulted in a great variety of tramcars being operated in the Metropolis. This is one of four volumes to cover the history of electric tramcar operation in the city, concentrating on routes to the north and north-west of the River Thames. This area was dominated by the Metropolitan Electric Tramways and was largely converted to trolleybus operation during the 1930s. AUTHOR: Brought up in Bradford, Peter Waller grew up witnessing the gradual decline of the city's trolleybus network. He studied history at university and also has a masters degree in industrial archaeology. In 1986, he began a career in publishing, working for a number of years for Ian Allan Publishing Ltd where he oversaw the commissioning and publication of a wide range of books. His first book, British and Irish Tramway Systems since 1945, was published in 1992 and since then he has written extensively on trans-port subjects. Moving to Shropshire in 2007, he is now a full-time author and editor and well as being a director and secretary of the Online Transport Archive and a committee member of the National Railway Heritage Awards. Peter is the author of the Lost Tramways series, looking back at the long lost tramway systems of major British towns and cities.