Hornby R30171 Class 110 2-Car DMU Train Pack in BR Blue Grey Livery with Metro Train Branding - OO Gauge

These DMUs were engineered to deal with the steep gradients of the Calder Valley route which it became synonymous with them becoming 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 route.