For the first time the entire tramway was closed in November 2007 for five months of essential repair work, the second phase of an £11.8 million upgrade. In January 2007 the City Class 611 prototype "supertram" was being tested on the tramway when it caught fire as it approached Central Pier, causing extensive damage. The driver escaped when the electrical console in the cab reportedly blew up. The tram, manufactured by Merseyside based Tram Power, was being tested as part of a bid to replace the current trams. The tramcar was rebuilt at a cost of £150,000 but was not permitted to resume trials; it is currently scheduled to form part of a trial park & ride tram line in Preston. The same tram had derailed on 30 May 2006 at Starr Gate loop during previous trials. A Rail Accident Investigation Branch report stated that the derailment was due to wear and tear on the track with a contributory factor being the new type of running gear on the tram.