Hornby R30171 RailRoad Plus MetroTrain Class 110 2 Car Train Pack E52075 - Era 7

History from Hornby's website:

Engineered to deal with the steep gradients of the Calder Valley route which it became synonymous with them being named 'Calder Valley sets', the Class 110 was one of the first DMU's with the highest power to weight ratio of any naturally aspirated unit. In 1982 the middle trailer car was removed from most sets to reduce maintenance costs and further improve acceleration along the northern route.