Merry-go-round train

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A merry-go-round train, often abbreviated to MGR, is a block train of hopper wagons which both loads and unloads its cargo while moving. In the United Kingdom, they are most commonly coal trains delivering to power stations. These trains were introduced in the 1960s, and were one of the few innovations of the Beeching cuts, along with investment from the Central Electricity Generating Board (CEGB) and the NCB (National Coal Board) into new power stations and loading facilities.