If it goes ahead, it would cover an area the size of three football pitches and it would be big enough to hold over two million gallons.
However, it is the contents of this farm-based lagoon that really is causing a stink amongst the residents of Longtown.
An application from two adjoined farms containing a thousand dairy cows has been submitted to build a lagoon to contain animal waste, also known as slurry.
***Andy Burn reports.*
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Arriva Rail North, Greater Anglia and South Western Railway are all affected.