via Oughtibridge. The bus ran at the same frequency as the tram and was timetabled to connect with the tram at Middlewood. Through single, return, day and week tickets were available to allow travel on both Supertram and SupertramLink bus services. On 1 June 2020, Stagecoach withdrew the dedicated SupertramLink bus from Middlewood to Stocksbridge, providing an enhanced service on local bus service 57 from Hillsborough to Stocksbridge in its place. Rolling stock Current fleet Stagecoach Supertram operates the following fleet across the network: Siemens-Duewag Supertram The network operates 25 three car trams built by Siemens-Duewag of Düsseldorf, Germany, in 1992. The trams are 40% low floor design, the vehicles have been specially designed for gradients as steep as 10%. In the 1980s a design choice was taken to create the longest possible vehicle to avoid multiple working which resulted in a design, the third-longest tram design in operation in Europe at the time and the longest in service in the UK until the long Edinburgh Trams were introduced. Launched in an initial light grey livery, following the awarding of the operating franchise to Stagecoach the trams were reliveried in Stagecoach's corporate livery from 1997. From 2006 the trams were refurbished, and a new dedicated Supertram blue–based livery was launched, with the entire fleet completed in early 2009. Stadler Citylink (Class 399) Stadler supplied seven tram-train vehicles, delivered between November 2015 and November 2016. Infrastructure Track The network is long, with of track. It features two types of track; tramway track where either pedestrians or road traffic share the right of way and ballasted railway track when there are no such requirements. Tramway track consists of a grooved tramway rail set into a concrete base with troughs into which the rails are laid. Most of the track is on-street using 35G-section grooved tram rail, with BS11-80A flat-bottom rail elsewhere. The railway track was supplied by British Steel Corporation Track Products of Workington and laid on sleepers consisting of concrete blocks with steel ties which gives a spring feeling when travelling on these sections. The track is laid on a bed of ballast which in turn rests on a prepared formation. Street crossings are usually laid with grooved tramway rails. There are some major structures. Two viaducts carry Supertram onto Park Square (a major road junction in the centre of the city), one of them being a six-span viaduct, the other