Original: The British Rail Class 506 was a 3 carriage Electric Multiple Unit ( EMU ) built for local services between Manchester , Glossop and Hadfield on the Woodhead Line , which was electrified in 1954 .
Simplified: The British Rail Class 506 was a 3 carriage Electric Multiple Unit ( EMU ) built for local services between Manchester , Glossop and Hadfield on the Woodhead Line .