Hopton Road and Lytham Road used for trams entering and leaving service only. A short stretch on the Promenade in Blackpool behind the Metropole Hotel was previously in this form, but was converted to reserved track during the 2011/12 tramway upgrade. Paved reserved track alongside a road, open to pedestrians but not road traffic – along most of the route between Starr Gate and Cabin. Reserved ballasted track, open to trams only – from Cabin to Rossall and along Radcliffe Road in Fleetwood. Interurban style, not following a road and open to trams only – from Rossall to Radcliffe Road, Fleetwood. Power supply The tramcars are powered by 600V overhead line with electricity transmitted to the tramcars by pantograph and a few vintage trams by trolley pole. Depots There are two active depots: Rigby Road Depot was built in 1935 and is still in use. It has a capacity of 108 trams. It was designed to replace the Bispham and Blundell Street depots and has been modernised several times. In 1955, tracks 15 to 18 were enclosed by a partition to be used as an electrical compound and in 1962, a tram-washing plant was built, along with the replacement of the roller-blind doors by folding aluminium doors. It has also been used to house some buses. Starr Gate Depot was built in 2011 by VolkerFitzpatrick as part of the complete network refurbishment and cost £20M. It officially opened in Easter 2012 and has a maximum capacity of 20 articulated trams. It was built to house the first 16 Flexity 2 trams, including an additional two added to the fleet in 2017. An expansion with a public attraction to display heritage units was planned when Rigby Road Depot was due to be disposed of, but was not built, with Rigby Road Depot being retained for the heritage trams. Previous depots There were five further depots that are now closed, mainly demolished: Bispham Depot was built in 1898 and extended in 1914 by Blackpool & Fleetwood Tramroad Company, to house 36 trams on six tracks. A substation was built to the side of the depot. The depot was used to receive pantograph cars in 1928 and Brush Railcoach cars in 1940. It closed on 27 October 1963 and was used as a store until the mid-1970s. It was demolished to make way for a Sainsbury's supermarket and the depot's headstone was installed