The Hadfield and Glossop Line is a railway line connecting the city of Manchester with the towns of Hadfield and Glossop in Derbyshire, England. Passenger services on the line are operated by Northern Rail. In December 1984, the Manchester - Glossop/Hadfield line electrification was converted from 1500 V DC to 25 kV AC. Class 303 EMUs took over from the veteran Class 506 units. The 303s later returned to the Glasgow area and were in turn replaced by Class 304 and Class 305 units before the more modern Class 323 units were introduced to the line in November 1997.