The E-class are three-section, four-bogie articulated trams, based on the Bombardier Flexity Swift design and built at Bombardier Transportation's Dandenong factory. The propulsion systems and bogies were imported from Bombardier's Mannheim and Siegen factories in Germany. Bombardier was selected on 27 September 2010 following a tendering process for 50 new low-floor trams, which was opened in 2009. The $303 million contract was for supply of 50 trams with maintenance to 2017, and included an option for a further 100 trams. The E-class trams are the first locally built Melbourne trams since the B-class in 1994.