 The line was heavily used for the shipment of bricks from the brickworks around Brill , and of cattle and milk from the dairy farms on the Wotton estate . By 1875 the line was carrying around 40 @,@ 000 gallons ( 180 @,@ 000 l ; 48 @,@ 000 US gal ) of milk each year . Delivery of linseed cake to the dairy farms and of coal to the area 's buildings were also important uses of the line . The line also began to carry large quantities of manure from London to the area 's farms , carrying 3 @,@ 200 tons ( 3 @,@ 300 t ) in 1872 . As it was the only physical link between the Tramway and the national railway network , almost all of this traffic passed through Quainton Road station . 
