13:00Andy PotterCelebrating 175 years of train building in Derby and the history of our currencyBBC Radio Derby Duration: 3 hours Tue 7th Oct 2014, 13:00 on BBC Radio DerbyRoyal Mint historian Dr Kevin Clancy chats about changes to the pound coin and Andy finds out about celebrations this weekend for 175 years of train building in Derby.GenresEntertainmentBrandAndy Potter Source: BBC Online