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operations allowed one person to control multiple locomotives. As many as 4-11 locomotives may be used for a heavy haul drag freight. Attempts were made to develop ultra large locomotives for this purpose, for example the Union
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locomotives owned by
National Power, Foster Yeoman, and other large bulk shippers were used on the heavy freights in the 1990s. Because of coupling limits, only single units were used.
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In the UK, such trains were called mineral trains and the locomotives that hauled them were called mineral locomotives. An example of a mineral locomotive was the
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Mineral goods train hauled by a single six-coupled LMS steam locomotive.
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Before and during WWI and into the 1920s, large locomotives such as the
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