A 1Co-Co1 wheel arrangement is essentially a Co-Co wheel arrangement with an unpowered, articulated pony truck...
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In railways, what does MGR stand for?
The term MGR stands for 'merry-go-round' which is used to describe the use of a specific hopper wagon designed to carry large amounts of loose bulk commodities such as coal, aggregates and grain.
The MGR system was introduced in the early 1960s after the 'Reshaping of the British Railways' as detailed by Dr. Beeching. The great advantage of the system lay in its ability to deliver large amounts of resources quickly to a specific destination, such as a coal-fired power station. Previously wagons delivering coal to a power station had to be individually shunted and unloaded in order to deliver their cargoes, this was a time-consuming and inefficient process.
The MGR system utilised specific hopper wagons that could be automatically loaded and unloaded. A locomotive fitted with slow speed control could deliver a number of wagons on a continuous loop from colliery to power station delivering coal, hence the adoption of the term MGR to describe this 'merry-go-round' process. The reduction in time and manpower made for a very efficient system with obvious cost savings. It has been estimated that under the MGR system, each hopper could deliver up to 14 times as much coal as a wagon operated under the previous manual system.
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