There have long been plans for a public transport network in Leeds, yet as of 2020, none have come to fruition. In the 1940s, there were plans to build an extensive underground system, however these were scuppered by the Second World War. There were plans for a Leeds Supertram in the 1990s and £500 million in funding was to be provided; however, due to spiralling costs, the plans were cancelled by the Transport Minister Alistair Darling in 2005, even though £40 million had already been spent on the project. Hopes were renewed with the proposal for a £250 million New Generation Transport Trolleybus service in 2007; however, after a long wait and millions of pounds spent on inquiries, the plans were cancelled in May 2016 citing little value for money.